That’s a well-known issue with most all browsers based on Chromium, and Vivaldi is based on Chromium.
Hang tight … let me search for the fix … okay, found it, check this Reply by myswtest:
This corruption happened to me on both my TW machines, with the last massive update. Yes, it affected my Chrome, Brave, and Opera browsers (also all based on Chromium). And it does happen now and then. I simply run the command found at the link above (to find and remove GPUCache subdir) and the browser magically works again.
BTW, this side effect is not just found on openSuse … other users of different distros also report the problem.