Lightening Flickering Issue

Hello, I’ve started experiencing a strange flickering issue that appears all around the world in my project. It worked all fine until yesterday, but the problem suddenly began. I use UltraDynamic Sky, but the issue persists even when I switch to Directional Light, leading me to assume it’s related to project settings. Could anyone please help me solve this problem?

Here are the things I tried:

PostProcessVolume - increase ‘Final Gather Quality’ to 30
Scalability Groups - set ‘Global illumination’ to Epic
Cmd - put ‘r.Lumen.Reflections.HierarchicalScreenTraces.Maxlterations 4’

These are the solutions I’ve found on YouTube and Google so far, but none have worked.
Your support would be highly appreciated…!

Thank you in advance.