I know its hard for you devs to find a consistent reply here.
It is hard to reproduce.
I either get the framedrop, critical error, or framedrop + CE. Guess its releated.
With hotfix RC patch, the framedrop is still persistent for me (but not that often).
2 frames at none or very low object models.
Different KOTH server.
View distance however is 3000 (also for objects).
The framedrop occures more often when the view distance is set higher than standard (KOTH v9)