The most likely culprit is the battery connection inside the device. I can only assume that the power interruptions happen while you are holding, setting down, or picking the Tab up. My Tab 3 10.1 would turn off and back on while I was playing a fighter pilot game; so I was moving and tilting it constantly. I thought it was the game until it did the same thing while watching a video, after just setting it down. It is just a momentary loss of connection. What you will need to do is take the tablet apart (carefully) and secure the battery to device connection. Most people just put a piece of tape over it, or criss-cross two band-aids over the clasp. I think it's pretty sorry that Samsung didn't do anything about this problem in the Tab 3, when the Tab 2 had the EXACT same problem.