Frankiefigs,
I would first recommend restarting the TV (versus unplugging it) to see if that fixes the issue, but it sounds like you have already tried that.
If you have the same TV twice, is what you're saying (the same model and year), and one is glitching on just that one channel and no other channels, it sounds to me like one of the TV's had a bad Amazon Prime channel update while the other TV didn't. It's not the TV else every channel would be crashing -- not just one.
If this just happened, then patience may be the best thing since a future update may be all that's needed to patch this problem you're having with this one TV. If you tried everything else on this thread, an immediate solution, until Amazon gets around to providing an update for their channel on that TV, is plugging a *Roku device or non-Roku device into that TV and watching Amazon Prime Video from that device until Amazon resolves this glitch that seems to be affecting many various Roku TVs. (*As far as I'm aware, since I haven't watched Amazon Prime Video in a while, I haven't yet had this issue with any of my Roku devices as it seems just to be occurring with Roku TV's, so in theory, plugging a Roku device into the TV and using that should be a temporary workaround till this issue is resolved.)
If your issue isn't resolved in a few days, I'd tell you to hard reset the TV if all the channels were crashing, but if it's just that one, I'd think that would be overkill. But if you tried everything on this thread, perhaps that may work, but then again, it might not. Personally, I would call Amazon before hard resetting the TV since you are paying for their service (and tell them that it's working fine on the other TV), but if they couldn't help you patch this and you already tried to hard reset with no results, then unfortunately, it may just be a waiting game.
I don't know if this was already mentioned on this thread, but you can try this (as well as everything else mentioned in this thread) after a few days because this might not work until an update (or potential patch) is eventually rolled out:
Scroll to the Amazon Prime Video channel on the home screen.
Click the "star" key on the remote, scroll to "Check for updates," and press "Ok."
Then hope for the best.
This glitch has been going on for quite some time with Amazon and Roku Smart TVs. To give you an example of how long it could potentially take to resolve this Roku issue with Amazon -- it took Hulu more than 6 months to finally fix their glitch that was crashing all my Roku devices and bringing them back to the home screen. That's a long time, but the issue did finally get resolved. This issue is a little different since the crash only occurred with Hulu when pressing the back key on the remote while watching a movie or show; however, hopefully, your issue will eventually be resolved with Amazon Prime and your TV, just as it was resolved with Hulu and my Roku devices. Sorry I couldn't be any more helpful than this.
And for everyone else who's reading this thread and having this problem:
By this time, Amazon is probably aware of this issue with various Roku TVs and should be working on a future update that will eventually fix this for everyone affected. Until that time happens, call Amazon and let them know that this issue is affecting your smart TV because they may be able to patch your specific TV. If I find that my Roku devices become affected by this glitch, I'll call Amazon and let them know.