Intermittent faults are the worst to troubleshoot. If you haven't changed anything recently software wise, I can only assume it must be a hardware fault, but exactly what is hard to tell.
Sonic Mania Plus is a great android, this is also a very helpful post. I play this game on my PC in the new version of the Sonic Mania Plus Available to download.
I'm mostly upgrading his hd, he has a 120gb in it now, lol, gonna give him a 2tb (1.5tb), not sure if he has it cfw or not, i haven't even turned it on yet. Ill mess w it tomorrow, I'm busy killing clowns right now.