UE5 flickering

Hi there,

how can I get rid of this flickering? It starts to flickering once I turn ON direct lights.
You can see demonstration on video:

my PC specs are:
AMD Ryzen Threadripper 1950x 16 core 3,4Ghz
64 Ram
Nvidia GeForce RTX 3080Ti 12GB
please help me to solve this!

thank you!