Has anyone else had issues with their rear power locks becoming weak or going bad?

It seems I hit the lock or unlock button and sometimes the actuator is able to move it to the desired position, and sometimes it doesnt.
So much so, that I have to reach in from the front and move the lock handle over. Then after that it is unlocked or locked

(and of course once I do that it seems to operate well for a little bit, but there is no telling when it will and wont operate properly)

Any ideas?

 

Just ordered the two rear locks for my wife's '08. On hers they'll be fine in the morning, but it seems that sitting in the afternoon sun causes them to get weak. And they switch around: sometimes only the pax side does it, sometimes only the driver's. Sometimes the driver's will unlock and none of the others, today the driver's was the only one that didn't unlock. So I'm doing the rears for now, pretty damn pricey. Will take a wait-and-see attitude on the fronts. Will post pics of the disassemblage and general destruction.

My '04 doesn't do this at all. It's a shame the older units don't fit the newer vehicles.