Whether the Court of Appeals may sua sponte raise an alleged inadequacy of its own Certificate of Appealability after the parties have fully briefed the merits

QUESTIONS PRESENTED Where the Court of Appeals itself grants a Certificate of Appealability and specifies the issue to be decided, the parties fully brief the merits, and the Government never objects to the adequacy of the COA, may the Court sua sponte raise an alleged inadequacy of its own COA? i