My 6+ is almost 2 years old, no warranty. In the last month, it has been plagued by screen freezes where it becomes unresponsive, and it has been randomly dialing people in my Contact list. At other times, the screen image is unstable, with a band of white light at the upper edge. Resetting the phone makes it usable until the problem happens again, usually later the same day. This may be a well-known problem, but I wanted to hear any current, permanent solutions. Thank you.