Have just read the roku thread and quite a few boxes went down whilst people played their switch with the new pokemon game. My son started to play the game Friday about 1 hour before the boxes went down, he's been on it most of the weekend and the boxes still have the same issue. Wonder if its just a coinsidence!
I'm the original poster and it now looks as though my son's Nintendo Switch is the cause of my problems.
I guess a Roku/Now TV software update is now conflicting somehow with Switch.
I can replicate the issue by switching aeroplane mode on and off. As soon as it goes online Now TV freezes and restarts.
I guess another update will be required as this was never a problem previously.
I have narrowed it down to just the new Pokémon game for the switch. It came out on Friday.
No other game causes this but as soon as Pokémon connects it freezes and reboots.
Where do we go from here I wonder.
It's not been a bad update from Roku but I guess only an update can fix things now.