When I send him to fix servers he started stuck often like he can't normally climb on the stairs to get server, or can't get out from the river. Plus I seen how his head was moving fast that probably causes to get stucked. In old versions it was happening not very often. (Sorry for grammar mistakes, I don't speak English)

Same problem. He can't climb a single ladder. He gets stuck in the railings and falls from there. And when he moves, he staggers as if he drank the entire liquor store.

Wtf. I followed him and he behaved normally and he starts to reach the servers(not on the first try, he keep falling).

I figured it out, it happens at low fps, near the monitors it drops a lot. I just walked away from the monitors and waited in the corridor where I have no problems with fps and Kerfur successfully completed his task.

My kerfus fell through the ground, now I'm looking for reports to write about this problem