This was posted in the Fenderrhodes forum by a member. I thought that I would post it here on his behalf.
Eric
Well, that was downright neighborly of you, EricK! To answer his question, yes. The tuning DOES settle in a stable temperature setting. At a gig, just shine a stage light on it while it tunes itself for up to half an hour. Keep the stage light on it at all times during the gig for keeping the tuning stable. I’m not an old synth guy, so I can’t speak for them. 
The real reason you do this is so the guys standing at the back can see it’s a Moog, silly.
Aw, Matt, you called my bluff! 