So at work, someone let me know of a problem they are having with their iPhone. They either have a 6+ or 6s+, I'm not sure. Essentially, what they told me is happening is the phone will be locked, and randomly(every few minutes, once an hour, etc.) the lock screen will show up, as if you hit the lock button. They say there is no notification or anything on the screen when this happens, and the screen turns off after a few seconds. Any idea what could be causing this? I looked at it, couldn't find anything but I don't really know what I'm looking for. Could they be getting an email or something similar, but the notifications for it are turned off, so it's just showing the lock screen? Or could it be a paired Bluetooth device doing this? Thanks for reading.