Following a jury trial, defendant was convicted of one count of breaking and entering an occupied building with the intent to commit larceny, MCL 750.110; MSA 28.305, and one count of conspiracy to commit a breaking and entering, MCL 750.157a; MSA 28.354(1) and MCL 750.110; MSA 28.305. Defendant later pleaded guilty of being an habitual offender, third pífense, MCL *200769.11; MSA 28.1083. In a separate proceeding, defendant pleaded guilty of resisting and obstructing an officer, MCL 750.479; MSA 28.747, arising out of an altercation with several correction officers that occurred while defendant was in jail awaiting sentencing for his earlier convictions. In exchange for the plea, the prosecutor agreed to the dismissal of defendant’s prior conspiracy conviction. The defendant was sentenced to six to fifteen years’ imprisonment for the breaking and entering conviction and sixteen to twenty-four months’ imprisonment for the resisting and obstructing conviction. Defendant now appeals as of right. We affirm in part and reverse in part.

i

On July 9, 1991, a jury trial was commenced with respect to defendant’s breaking and entering and conspiracy charges. On the second day of trial, following testimony by a rebuttal witness, the trial court declared a recess and excused the jury for a "morning break.” During the recess, the trial court received a note from the jury room. On the note, four questions were written regarding evidentiary matters. From the handwriting on the note, it appears that the four questions were written by three different jurors. Questions A and B appear to be in the same handwriting. A second juror appears to have written question C, while a third juror appears to have written question D. The following questions were written on the note:

(A) Fingerprints on stereo equipment!?]

(B) If so whose[?]

(C) Who woke up Mr. Kutherford shortly before Officer Brooks spoke to him? Did anyone?

(D) Did anyone ever talk to Angela Slocum’s aunt *201to confirm the time Angela visited & dropped off her child.

After receiving the note, the trial court immediately summoned the jury to the courtroom and sua sponte declared a mistrial.1 Without consulting the attorneys or the parties, the trial court ruled that the note evidenced the start of the jury’s deliberations, thereby necessitating a mistrial.

Following reinstatement of the charges, defendant moved to dismiss the case on the ground that a retrial would violate his constitutional rights against double jeopardy.2 Defendant argued that the trial , court’s declaration of a mistrial was not prompted by manifest necessity. In denying defendant’s motion, the trial court ruled that there was no reasonable alternative to granting a mistrial. The lower court concluded that it was clear from the jurors’ note that the jury had discussed the case among themselves. Subsequently, defendant was retried and convicted on the charges.

n

Defendant argues on appeal that the trial court’s declaration of a mistrial was not prompted by manifest necessity. We agree. Jeopardy attaches in a jury trial once the jury is empaneled *202and sworn. Critz v Bretz, 437 US 28, 38; 98 S Ct 2156; 57 L Ed 2d 24 (1978); People v Brower, 164 Mich App 242, 245; 416 NW2d 397 (1987), lv den 430 Mich 864 (1988), cert den 488 US 933 (1988). Because double jeopardy protection attaches before the end of a trial, a trial court’s declaration sua sponte of a mistrial bars retrial of a defendant unless the mistrial was prompted by manifest necessity. People v Dawson, 431 Mich 234, 252; 427 NW2d 886 (1988). Therefore, a trial court should avoid declaring a mistrial sua sponte without first holding a hearing on the record and making explicit findings that no reasonable alternative exists, People v Benton, 402 Mich 47, 61; 260 NW2d 77 (1977) (opinion by Levin, J.).

Although there is no precise test concerning what constitutes "manifest necessity,” it appears to refer to the existence of sufficiently compelling circumstances that would otherwise deprive the defendant of a fair trial or make its completion impossible.3 Accordingly, " 'A trial judge properly exercises his discretion to declare a mistrial if an impartial verdict cannot be reached, or if a verdict of conviction . . . would have to be reversed on appeal due to an obvious procedural error in the trial.’ ” Benton, supra at 57, quoting Illinois v *203Somerville, 410 US 458, 464; 93 S Ct 1066; 35 L Ed 2d 425 (1973).

Absent evidence that the jurors had discussed the case or that defendant was otherwise prejudiced, a defendant’s right to an impartial trial is not compromised by written questions submitted by the jury before closing arguments. People v White, 144 Mich App 698, 700-701; 376 NW2d 184 (1985); Clapham v Yanga, 102 Mich App 47; 300 NW2d 727 (1980); People v Scott, 55 Mich App 739; 223 NW2d 330 (1974). In White, the trial judge gave the members of the jury preliminary instructions that they were not to discuss the case among themselves until after the conclusion of the trial. 144 Mich App 700. Further, the trial judge also instructed the members of the jury to submit any questions they had, in writing, to the trial judge and not to discuss the case with the other members of the jury. Id. Before closing arguments, ten questions were submitted in writing by the jurors. Id. In affirming the defendant’s conviction, this Court held that an inference that the jury had begun deliberations could not be drawn solely from the evidence of the questions submitted by the jury.

In light of White, we are convinced that there was not manifest necessity for the declaration of the mistrial. The actions of the jury would not have required reversal had defendant been convicted at the first trial. Here, the trial judge improperly assumed that the jury had begun its deliberations on the basis of the jurors’ questions. Moreover, the trial judge failed to hold a hearing to discuss alternatives or to obtain consent before declaring a mistrial. Under these circumstances, the retrial violated defendant’s rights against double jeopardy as guaranteed by the United States and Michigan Constitutions. Defendant’s convic*204tions of breaking and entering and being an habitual offender, third offense, are hereby reversed.

HI

Defendant next argues that his sixteen- to twenty-four-month sentence for his resisting and obstructing conviction violates the principle of proportionality in People v Milbourn, 435 Mich 630; 461 NW2d 1 (1990). However, because defendant has already served his minimum sentence, we decline to review this issue. Where a subsequent event renders it impossible for this Court to fashion a remedy, an issue becomes moot. See, e.g., People v Greenberg, 176 Mich App 296, 302; 439 NW2d 336 (1989); Crawford Co v Secretary of State, 160 Mich App 88, 93; 408 NW2d 112 (1987).

Affirmed in part and reversed in part.

(concurring in part and dissenting in part). I join Part iii of the majority opinion. I agree that defendant’s challenge to his sentence for resisting and obstructing an officer, MCL 750.479; MSA 28.747, is moot because defendant has served that sentence.

I dissent from the holding that defendant’s retrial on charges of breaking and entering, MCL 750.110; MSA 28.305, and conspiracy to break and enter, MCL 750.157a; MSA 28.354(1) and MCL 750.110; MSA 28.305, offended the protection against double jeopardy, US Const, Am V; Const 1963, art 1, § 15. First, I am not persuaded that the judge sua sponte declared a mistrial. Ante at 201, n 1. Defendant sought a mistrial on grounds of prosecutorial misconduct in the rebuttal argument. The court declared a mistrial on grounds *205different from the ground identified by defendant. It found juror misconduct for violation of previous instructions. However, the court ruled after the defendant had first moved for a mistrial. A defendant who moves for or consents to a mistrial waives double jeopardy claims, whether or not a manifest necessity for mistrial exists. People v Benton, 402 Mich 42; 260 NW2d 77 (1977) (opinion by Levin, J.).

The transcript reflects:

Mr. Evans: Yes your Honor, I am making a motion for mistrial on the basis of the prosecutor’s —at least two questions to Deputy Brooks on — in rebuttal, in the rebuttal portion of the prosecutor’s trial case. . . . That’s improperly using the defendant’s silence against him and the jury should not have heard that and it is — and on that basis I am moving for a mistrial.

Mr. Rettig: Ah, your Honor, in the first place, in perspective, that was on rebuttal, as I believe you will recall, after Mr. Rutherford stated that he. had never seen Mr. Brooks until yesterday at trial. Rebuttal testimony—

The Court: I am going to stop you. We have a serious problem. This jury is in here deliberating. They asked a question earlier, could we hear Mrs. Slocum’s testimony because she was very inaudible yesterday, and I think she was. The court officer was instructed to tell them not to discuss the case, that we would deal with their questions later.

The trial court later questioned whether the defendant objected to the mistrial and accepted responsibility for the decision to mistry the case, stating it was the court’s decision sua sponte. Defendant did not stipulate to mistrial in response to the court’s inquiry whether he objected. Despite the court’s characterization, I am unwilling to overlook the procedural posture, i.e., that defen*206dant moved for a mistrial. The rationale for the granting of the mistrial was the court’s; the motion originated with defendant. Because defendant moved for a mistrial, he waived the double jeopardy protection. Defendant’s initial willingness to abort the trial distinguishes this case from People v White, 144 Mich App 698, 700-701; 376 NW2d 184 (1985).

For this reason, I would affirm all defendant’s convictions.