It seems that my 360's controller has a mind of it's own, lately.

Physically, the controller is centered fine. But every game I play, the controller tends to want to keep moving up or forward.

It's negatively affecting my playing. And it makes games like Ikaruga and Triggerheart Exellica virtually impossible to play. It's also gotten me killed several times while playing GTA 4 - especially the "Luck of the Irish" mission. All of a sudden, Niko just walks off the roof to his death, when I'm not even touching the analog stick.

Is anyone else suffering from this, or is it just me? It's starting to piss me off. And I don't wanna have to buy a new controller.