Wandering Servo's and loosing trims

I posted this over on RCGroups as well, but since all we talk about over here is radios, I figured this might be a better crew

Anybody else run into the "wandering servo" issue? As in, you center everything up prior to a build, but once it's installed and finished, after a couple minutes the servo decides it wants to "wander" to one extreme or the other? Granted I use cheap servo's in foam planes, but I'm wondering if an hour or two worth of burn in testing would eliminate this?

Also - anyone have an issue with loosing trims when switching between models? Seems like I always have to retrim - not sure if it's TX, RX or normal issue....???

No issues for me, some jitter yes, that can be the Pots in servo or TX.
From one side to the other sounds like broken wire on the pot.

Burn in test of servos on a servo tester isn't a bad idea, especially when expensive model you don't want to loose....