A few months ago I noticed that majority of the apps on my lumia 520 keeps crashing (even Calendar and battery saver). I tried resetting but that didn't solve the issue. Then recently I could not connect to wifi. A message popped up saying "can't do this right now. Try again later or restart your phone) every time I tried connecting to wifi. Then I couldn't get a mobile data connection. Every time I tried turning on the data connection, nothing would happen. So I've reset my phone a couple times and the problem persisted. Just yesterday I got a notification saying there's a problem with the access point settings. Resetting and switching the phone on and off did not resolve the issue. My phone also does not read on the PC when I connect it with the USB. Does anyone know what the problem is or how I can solve these issues?