Game crashes after build swap

I changed build from PConc to Viper Strike of the Mamba and now I got problem - almost every time I one-shot screen full of monsters - game dies. It thinks for a while and, usually, drops me to main menu. I'm at the point where I have a chance to run out of portal.

Ambush is unplayable, Domination is 50\50, scared to check Incursion.


Pretty sure 12700k\4090 should handle this, but is this server or local PC problem?