I have a 2016 Anthem 44B and I have the same issue with that shade. When in storage, I would put the shade down and the next day it would be up. It appears to only happen when the sun strongly hits the passenger side. Not only is the shade motor on that side but the control board for the shades is behind the compartment above the entry door. I think the heat on the control board may be the culprit. It has never affected the night shade however.
These machines are full of little gremlins running through the systems causing grief.