Game randomly freezes when i clicks Create A Class button

[kmsea]

So i solved 'crashes after few games' issue. i downloaded github release of bot warfare now seems like game works fine. thanks for help
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but i encountered new problem. when i clicks 'Create A Class' button, the game freezes. due to this issue i had to restart the game.
when i playing for less than hours are fine. but it seems like this happens when i played for more than hours long. it happens at private match lobby and main menu both.
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i'm using steam version for using plutonium. is there any way to solve it? thanks for reading.