These are notorious for melting down due to unfortunate design. After a repair, I wanted to update the design to never fail again. I'm sure I went overboard, but it's cool and quiet and I like both those things. I ended up using the 45-55C temperature range on the controller in the end after extended load testing.
I have a second channel:
https://www.youtube.com/channel/UCN3Dgu6CVBcecDkc5DmIIqw