Keyboard/Mouse locks up randomly

During random matches my mouse and keyboard locks up and I continue to go whatever way i was going before it locked up. It usually ends during a 10 second period. It only happens when I'm in CF.

I used to have a problem similar to this also.

What I did to fix it is that when I opened crossfire, I opened my task manager(CTRL + ALT + DEL), then went to the processes tab, looked for crossfire.exe, and then set the priority to low.