Roblox Studio testing game does not work anymore

Hi, I know this category isnt for a problem like this here but I really need help in Roblox Studio. So everything works perfectly fine except testing the game. When I want to test the game everything crashes and all my work is gone. I really dont know how to fix that and I also tried to contact the Roblox Support but they didnt really help either. Also its only this Roblox Studio file and the other files with old versions of the same game. Here are some pictures of Roblox Studio crashing when I want to test the game:
fehlermeldungen

Roblox Crash 28.12.2021 11_13_58

sometimes Roblox Studio just crashes without any errors like the Roblox Crash. Can you guys please help me fixing this? Maybe without reinstalling Roblox Studio? I am scared about losing my files. I would be happy about anyone helping me. Oh and sometimes I get an error like: Couldnt make a recovery file or bad alocation.

Type “script” in the Explorer’s search bar. Look through everything that comes up and make sure you don’t have a virus in your game.

I checked some scripts and I didnt add any free models in my game but I will look again. I also looked in the console. What I should mention is that the game does work on the roblox website but not in roblox studio

nope didnt find any virusses maybe it could be something with the memory or something?