My TV now seems to be functioning properly.
It shut off randomly again two days ago and, just as before, when I turned it back on I full control over it. I went through the settings menu this time to see if I could find something that might be causing the problem (I really should have done this before now...).
What seems to have worked is enabling the "Fast TV Start" option:
Setting > System > Power > Fast TV Start > Enable
I waited a few days before posting this, just to make sure things were still working. There haven't been any updates since I made this change, so I don't know if it things will revert once there is.
Roku support - please don't mark this as solved yet. If others with this problem are quick about it, they may be able to get through the menu to update this setting before their system freezes BUT the system shouldn't be freezing in the first place. There is still an underlying problem here that needs to be addressed.
Grrrr!!!!
My TV started having this issue again this morning. I thought that there might have been an update that disabled the Fast TV Start option but when I looked at it, it still showed that the box was checked. I (stupidly?) unchecked it, thinking that doing the old "have you tried turning it off and on" trick might work, but that seems to have made everything worse.
The system froze right after I disabled the fast start. Now, when I turn the TV back on, I'm not able to even get to my home screen because I'm being blocked by an update. An update that won't run because of this flipping 15 second freeze.
I'm getting an error message: Error 023.1
"Something went wrong. You can check your network settings (managed to do that; it's hard-wired not wifi and everything is fine), factory reset your device (I shouldn't need to do this!!!!) or try updating again (tried several times)."
If I try to turn the TV on without the ethernet cable plugged in, I just get a Software Update / Waiting for network popup which freezes because, you know, the TV freezes up after about 15 seconds.
