[backwards]

Okay where there's no commands in the source engine that allow the server to control the frame rate. It would have to be a type of bug that allows this to happen. However that functionality would be a big security issue. Debug the issue by commenting out half the cfg file lines with // or copy paste half into the cfg and restart the server and see if the problem persists, than copy half of the next half into the cfg and continue until you find the command.