Thanks for the feedback. I tried being very careful in-out but couldn't remember every time, so I finally set it and removed the handle - hasn't moved in four days. Now I just need to build a cover or smaller handle.
When I first took it to dealer for this problem, they replaced the mechanism. To do this, they had to tear down the seat. Then they put it back together funny. Now it feels like a cheap 20 year old matress - bulging in the center and I can feel the springs. Very, VERY uncomfortable. Took it back to dealer and of course they say it was put back together right and is perfectly normal. Truck only has 23K miles, and only weigh 160 lbs. Anyone else feeling the springs?