DD1 oscillating at standstill

Hi, just wondering why this happened:

I race in iRacing and I put all the settings as they are listed here, in Fanalab and in the game. I usually drive with FFB strength set to 4 (6 is too much).

For fun I put the FFB strength at max once just to see what happened, and boy was I in for a treat :D

Anyway, I put by FFB strength back to 4, but now my wheel starts oscillating when standing still in the pits, or right after a crash when standing still on track. As soon as I hold it firmly the oscillations stop. Any idea why it does that now, and it didn't do that before my "max force" excursion?

Especially when crashing it's annoying as I tend to let go of the wheel before impact, and the wheel immediately starts oscillating and doesn't stop.

Thanks