Hey Inzyman, I've had this issue with Pcars, Pcars2, AC and GTsport. If it's the same thing me and some of my friends are getting it's probably an issue with the wheel and not the game.
You can search for "t300 random button press" and find loads of threads all over with people having the same problem.
As far as I know it's to do with the connector between the rim and the base losing connection momentarily which will result in a random button activation.
I've found it happens to me when there is a certain amount of flex between the rim and buttonbox/base and that tightening the 6 allen bolts on the front can get rid of this flexing for a while (be carefull not to put too much force into tightening these bolts as you can can damage them quite easily)
I have found other methods that claim to get rid of the problem which would involve placing a washer behind the connector coming from the base, but I have not tried this yet as it would possibly involve me opening up the base and thus voiding my warranty (which is a good thing not to do with thrustmaster products).
anyway there should be plenty of info out there for you to read up on and find out if you are having the same problem.
good luck