check these topics , I had same problem: https://www.dotabuff.com/topics/2020-07-07-directx-10-or-directx-11-which-is-better-for-dota2
https://www.dotabuff.com/topics/2020-07-01-screen-freeze
-so as a result u might have low end pc so USE DX9, Also do Disk defragement after every heavy upd and if you can, change ur hard to SSD instead of HDD(100% fix)
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My dota occassionally freezes then crashes, my other games run just fine. Almost lost a game cuz of this
How to fix?