I have the 4k Roku ultra hooked up to my Sony tv. It has been working fine, but I am wondering if there was an update that changed something with my Youtube App. It seems to be freezing a lot over the past week. When I try to go back to previous screen it freezes and then stays stuck. I can't do anything with the remote at all, all I have a frozen black screen. Eventually it reboots itself. It only seems to be happening with the youtube app. At least I think. And it just started recently. I notice if I pause something and then try to resume it can happen also. I deleted the youtube App and reinstalled it, but that didn't help. It's still doing it. Any help?