So electric flaps stopped working, called my mechanic , and he said to check the rubber roller in the flap motor, it was stuck.

Moved it by hand got it un stuck and flaps work fine now.

Has anyone have this happened with their Cessna?
The fix was too easy and cheap to make me confident.

According to my mechanic its probable a tall passenger bump the area below the flap lever and hit the switch.(I did have a tall passenger 2 days ago).
Does this theory sounds right?

So he's saying that someone wacked their head underneath the wing hard enough to affect the flap motor through the skin?

And he's also implying that there was no neck or skull injury?

I believe he means the tall passenger bumped their knee on the flap switch

Yes

Sounds like a brush hang or dead spot in the commutator.

I think you're right Michael. My 182 flaps went inoperative 3 years ago, and the mechanic looked at the switch, and found nothing wrong. Then he took the inspection cover off under the flap motor in the wing and turned the flap motor shaft, and the flaps worked. It never did it again, surmising that the motor might have stopped on bad spot on the commutator and hasn't done it again.