I am having the same problems but haven't had time to look into it. I have a 2021 Legacy 3791RD with the Super Solar Flex option. I'm thinking I may have the same issues here:
https://www.montanaowners.com/forums...ad.php?t=84020
But I'm not sure if it is really tied to the load shed with the solar. I wonder if to crank these out faster if they might have used the cool only controllers everywhere. Given most owners put the trailer away in the winter, it might not be noticed enough.