What's wrong with my wheel

I know this is logitech but I couldn't find any different place to ask this. So I have a cobra gt900 wheel and it worked well for 3 years I think but recently I started playing euro truck and after some time I noticed that the longer I play the less sensitive the wheel gets. I need to turn like 10 or more degrees to the right to it move on the screen and it feels kinda loose when I turn it while on the left I think it's less than 5 degrees does anybody know how to fix this or if it's an software problem or wheel problem?