I see... Sounds like you have it figured right then. Sometimes they can change setting after they heat up just a bit. Electronics can have an operating temperature just like a car. Do you remember tubes? They wouldn’t even work as they were designed until they got warmed up to operating temp. :)
I’m actually old enough to remember ‘tubes’.
(blush)
Some dimmers are quite touchy / flaky in the lower part of their range.
My Mom has a dimmer “light switch” controlling a dimmable flood bulb (CFL, I think) in her dining room ceiling. If one turns it down to the bottom part of its range, any incoming voltage fluctuation turns it off, and it can only be reset by switching it all the way off, then back on (the control has a rotary “dim” function and a push on - push off function). This is interesting because slowly turning the light all the way down with the dim function does not create that need to “reboot”. So far as I can tell, heat is also not the problem. But, “who knows”...