Any seasonal changes?
It would seem to me that if you get notifications when changing from dark to light then you would likewise get notifications when changing from light to dark.
However, the sun and thus shadows are at opposite points of the compass which may explain why there are no notifications in the evening.
I would try redirecting the camera just a little bit in small increments with regards to its' "morning orientation".
Maybe some sort of small shade to slow the morning transistion from dark to light. Or the opposite - maybe a bit pruning or otherwise trying to affect the sudden loss of shadowing in the morning.
Experiment a bit, do nothing permanent, and see if you can stop or at least limit the notifications.