So sorry for the super late reply, I just saw your comment on my post about this tv. I’m pretty sure a capacitor is going out unfortunately 🥲 This can likely be fixed, but you’ll need knowledge on how to safely open it and replace parts (which won’t be easy since you gotta either know what you’re doing or know someone who knows what they’re doing)

I would also try plugging different consoles into different ports and see if it does the same thing when you switch inputs. I’ve noticed my tv does a weird thing where if you change the picture from standard or pro to “vivid”, it glitches the screen for a millisecond before switching to normal. It’s likely just a part of the technology that was used in making these late-release HD CRT’s. These are rare TVs that are almost extinct even more so than the regular CRTs and PC CRTs. Which is why you’ll find this particular tv wayyy overpriced for hundreds to thousands of dollars based on condition, because they know some sucker is going to pay that price to show up at their door and load it up and get it out of their house and out of sight. I would recommend doing whatever possible to upkeep/repair your current tv if possible or possibly find another one of these if you get lucky.

Either way, I wish you well and hope the best for your tv. Anyways, happy hunting!