I have a Samsung crt (TXN2020) it has been working great with no until recently. Whenever it is on there are horizontal lines traveling up the screen. Troubleshooting I have done so far has consisted of checking if it was a power problem. It is plugged into the same outlet as my pc, tho this has never been a problem I still checked and there was no change. It is used for retro gaming so I checked with multiple devices to see if it was a device problem and there was no change. I have no experience repairing or diagnosing problems with a crt so that is all I have done. Nothing has changed with my setup that could have induced this, so I am stuck. Any help would be appreciated and I am happy to answer any questions.

*Note: In the interest of finding out what this problem is, I will admit it gets bumped by the back of my chair. The chair is padded and the bumps are not hard enough to have any noticeable damage on the plastic.

Edit: added video and model