In this 28 U.S.C. § 2254 proceeding, Wilbert Patrick Stewart, Texas prisoner # 1833832, challenged the calculation of his sentence following his parole revocation. He now seeks a certificate of appealability (COA) to challenge a district court order dated May 30, 2014. In the order, the district court denied, without prejudice, Stewart’s motions for a COA and leave to proceed in forma pauperis on appeal. Stewart filed these motions to appeal a magistrate judge’s memorandum and recommendation, which the district court had not yet considered.

We must examine the basis of our jurisdiction, sua sponte, if necessary. Mosley v. Cozby, 813 F.2d 659, 660 (5th Cir. 1987). The district court’s May 2014 order is not final or otherwise appealable. See Dardar v. Lafourche Realty Co., 849 F.2d 955, 957 (5th Cir. 1988). Accordingly, the appeal is DISMISSED for lack of appellate jurisdiction, and Stewart’s COA application is denied as moot.

We note that, in addition to the instant appeal, Stewart has filed two other appeals during this § 2254 proceeding. See Stewart v. Stephens, No. 1440535; Stewart *174 v. Stephens, No. 14-40835. We dismissed one of those appeals for lack of appellate jurisdiction, see Stewart v. Stephens, No. 14-40535 (5th Cir. Aug. 19, 2014), and denied a COA as to the other, see Stewart v. Stephens, No. 14-40835 (5th Cir. Mar. 4, 2015). Stewart is CAUTIONED that future frivolous or repetitive filings will result in the imposition of sanctions, including dismissal, monetary sanctions, and restrictions on his ability to file pleadings in this court or any court subject to this court’s jurisdiction. Stewart should review all pending matters in this court and move to dismiss any that are frivolous or repetitive.