Apps crash android 4,2,2.?

Question

Android

Good day. Straight to the point.
There is a lenovo p780 phone, everything was fine, but one fine day the applications started to crash. Toist crashes an error, let's say Google + does not respond or completed with an error, I don’t remember exactly, after that, don’t run such an error on the application that I’m trying to run. Almost everything stops working. After a restart, everything can work for about a day, after which everything starts to crash again. I downloaded antivirus SM, I thought, well, what the hell is not joking. I found threats, but the problem remained, I deleted Google application updates, the wedge of the master, etc., I thought maybe something got crooked, it didn’t help. Not so long ago I tried to install a broken Poweramp player, installed a breakdown and some other crap, after that I demolished everything, and put the game from the fallout shelter play market, nothing else was installed for a very long time.
Thank you all in advance.

Answer 1

if there is no root - do a factory reset (wipe data). And if it was rutted, then it's better to reflash.
Maybe some program has been crookedly updated there, but the application cache in android can only be restored by resetting it.