I still have one on my 07 Winnebago Tour. When I first got one probably 10 years ago, I had four of them crap out on me under warranty.
There is a box on the stabilizer that has a solenoid in it. That's the solenoid that locks the position. Often water gets into the box and solenoid fails. I've also had the solenoid break free as it's only spot welded.
When you press the button, you should hear a distinctive click from that solenoid.
So if you're losing your positioning, that box is a good place to start.
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 20 years & 200,000+ miles