What's a Roku? And have taken your PS4 in for a service to diagnose/fix the problem? I have heard that some PS3s would experience random glitches (powering off for no reason, not ejecting discs etc). Could just be a random design flaw.
It's a streaming device, similar to an Amazon Fire Stick.
I haven't taken it in, because it's an older unit, and I bought it used.