Are you talking about the Voyager or the Minimoog?
My Minimoogs (1979 and 2017) and my 2003 built Voyager is are all very stable once they warm up. But you need to adjust the global tune a bit, if the room temperature is changed by more than 5°C suddenly. I never had to retune them on stage. I had these synths on stage inside in cold 300 feet high ex gas storage tank of about 10°C. And on an open air on a hot sunny summer day. Or inside a never used atomic plant cooling dome at night with a fresh summer night with stars above and the ISS seen crossing high above.
But I also experienced catastrophic tuning problems (intervals were off) with a friends Vermona Perfourmer during an open air when the air cooled down at night. While my Voyager just needed a slight adjustment in master tune.