Škoda, že jsi neprozradil, u jaké to dělá hry a jaký máš operační systém. To se pak docela těžko radí.
Nicméně:
It's a compatibility issue with Nvidia GPU's and 24H2. Not much we can do but wait for Microsoft or Nvidia to release an update to fix it.
Řešení:
Fixed in the latest Insider update - 'Fixed an underlying issue which could cause the screen to go black for a few seconds for some people when using ALT + Tab'