Just got this note 5 a little over 2 weeks ago. Been great except for this issue. Out of the blue, I'll notice that I've received no call, no texts, no activity of any kind. This is my work phone so that's unusual. When I try to use the phone, calls don't go through, nor texts. The cell radio shuts off and nothing will start it up again but a restart. No airplane mode on/off. This has happened three time is about two weeks. I tried wiping cache, no help. Don't really want to go the factory reset unless absolutely necessary. Any ideas? This can't be normal.