Scrambled video problem

Just bumping this up to see if anyone has any new ideas? My footage is youtube videos I've downloaded from a couple of sites that download them as mp4s.

I tried downloading the same video from a different site and replaced my source footage with the new one but had the exact same glitches. This is like the world's most impossible bug to fix it keeps appearing and then disappearing for no reason.

I'll see the scrambled problem on a segment on my timeline so I'll export just that part and then the scambled problem is gone. I will then export a slightly longer segment which includes that part and yay it's back again.

I uploaded the segment to Youtube and watched it on a different device and problem still there so it's not unique to my PC. I also downloaded yet another studio game driver (latest one) and nothing's changed. The issue clearly isn't with the source footage because the issue keeps disappearing and reappearing in the same segment, I'm nearly ready to give up here but I've worked hard and long on this video and I don't want this irritating bug ruining my hard work.

Any ideas anyone?

Are any of your source clips from a smartphone or a screen recording?  If so the problem may be variable frame rate sources which can cause intermittent and unpredictable problems.

Here's how to confirm the issue and workaround it

use mediainfo to determine whether your source is variable or constant frame rate
https://mediaarea.net/en/MediaInfo/Download
if it's variable use handbrake to convert to constant frame rate setting the quality slider in the video panel to maximum
https://handbrake.fr
and here's a tutorial on how to use handbrake
https://www.youtube.com/watch?time_continue=34&v=xlvxgVREX-Y

I've never seen that before, so 2 ideas

1st idea

Do not count on Windows to be fully up to date when it comes to device drivers
Go to the vendor site to be sure you have an updated driver for your graphic adapter
nVidia Driver Downloads http://www.nvidia.com/Download/index.aspx?lang=en-us
-for Premiere Pro (and MAYBE Premiere Elements) use the STUDIO driver, not the GAMING driver
-such as (this MAY not be the latest) https://www.nvidia.in/Download/driverResults.aspx/177929/en-in
If you have a laptop you MAY also need to check for a laptop specific nVidia driver
ATI Driver https://www.amd.com/en/support
Intel https://downloadcenter.intel.com/product/211969/Intel-HD-Graphics-Family
There are also intermittent reports that the newest driver is not always the best driver due to driver bugs or compatibility issues, so you MAY need to try an earlier driver version

2nd idea

Some things to do, and more information needed for someone to help...
-PPro Editing Information FAQ https://community.adobe.com/t5/Premiere-Pro/FAQ-What-information-should-I-provide-when-asking-a-question-on/td-p/3929027
-Troubleshooting https://community.adobe.com/t5/Premiere-Pro/Unofficial-Premiere-Pro-Troubleshooting-Guide/td-p/8789200
-Mac only https://community.adobe.com/t5/Premiere-Pro/FAQ-Basic-Troubleshooting-amp-Maintenance-for-Premiere-Pro-on/td-p/4788764