I need help, strange things are happening with the game.

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I forgot, do NOT upvote this post (it's not here for that)

So the situation is that I downloaded user maps from the workshop, launch the game, and these maps cause the game to run for 15-20 minutes before crashing the Steam client hard.

Something similar is happening with L4D2, after connecting I get kicked out after 30 minutes.

My actions:

  1. I deleted the game and reinstalled it - it didn’t help.

  2. I cleared the Steam folder and exited the beta - it didn’t help.

  3. I reinstalled the maps - it didn’t help.

What other solutions to this problem might I have missed? Please advise how to fix the issue.