Crossfire In-Game Bug - Getting Stuck on walls

Okay, This is a wierd one.

For some reason, on a lot of games, I will just be jumping around and If I jump into a wall or a object I will get stuck to it. I will be able to move my mouse, but crouching or anything does not work.

When I get stuck, I start moving upwards slowly untill I hit the roof. On some occassions, It's happened in open areas where I am just floating upwards slowly. Then when I get to the top or to a point where it cant go up anymore, it resets and puts me back on the floor and continues to push me back up.

I have tried loads of things to try and get out of it but I get completely stuck and have to leave the game.

After a while a error message comes up, and then I press Okay, then it finally just disconnects from the game.

How can I fix this? It's getting really annoying and happening more and more.

Thanks