Yes! This happens *regularly* with my DFGT. Sharp turns of the wheel will cause a random button on the face to activate itself. No, fingers are NOT slipping.
Most common is that the realtime adjustment dial menu will pop up. No big deal there, just annoying. I tap the button again to make the menu go away and keep going.
Often enough though, it will activate the Start button, which obviously pauses the race and gives you the continue/restart etc choices. This is distracting and obviously disrupts the rhythm of your driving.
Sometimes, it infuriatingly trips the PS3 button, which pulls up the XMB while your race continues in the background and you watch helplessly as the car slams headon into a wall. This usually ruins the race. Restart, or fetch a large hammer.
It never happens on smooth turns, only when the wheel is turned sharply/suddenly. It must have something to do with contacts being loose or similar.