So sometimes in the middle of a game it decides to randomly open the in-race PU-buy menu. Sometimes this means it doesn't respond to the keyboard at all anymore and I have to buy a random PU just to get out of that menu, only for it to immediately open up again. Restarting the race doesn't help, as it will open that same damn menu right after the count down.

In the short pauses between opening the menu controls are unresponive and the car drives on it's own.

Has anyone else had similar issues, and if so, did you manage to fix it somehow?

that means that you have a locked up key somewhere. rebooting might solve your problem.