Its been about two and a half years since i have purchased my lumia 1520. Since almost a month or two, my phone suddenly hangs. and then d screen flickers quite a bit. If i have a chat window open automatically a few keys are selected and typed. sometimes the screen flickers when the phone is unlocked and it automatically enters wrong pin continuously. Not sure if this is because of the windows 10 upgrade. Is someone else facing the same or similar issues? can someone pls help me out in trying to sort fix this problem?