Random app crashes on HTC 310

So, recently... out of nowhere really, my phone started having some really weird problems... i can't access Viber main page where you can see all chats, it is black for few seconds then goes back to home page... only if i opet specific chat from notification... then i can't access Poweramp library, it goes to home page... i can every other menu tho... then i can't access Contacts app, same thing.. goes to home page... and this happens to few other apps as well... it was saying "Unfortunately, [app] has stopped working" before... now it doesn't say anything... clearing cache for those apps didn't helped, reinstalling didn't help... even system reset didn't help... i really don't know what to do... this started happening so randomly and just to certain app parts, not the whole app. Please help!