I've had this problem on and off for awhile now but for some reason it didn't get to serious until recently. So, here's the sernerio: I open File Explorer and click on a pictue folder and then I scroll down through the thumbnails and then after about a minute it would jump back up to the top again. It really got annoying this time.
So online I went and found a solution that works for some but not others. In my case it worked for me.
Just right click on your desktop, click on Personalize, in the left hand menu click on Colors. Then under Choose your color, uncheck Automatically pick an accent color from my background. With this checked the color of the taskbar will change depending on the background picture.
I scrolled down through the pictures in my folder and left it for almost an hour and it didn't pop back up.