Some schedules not working recently

I have two programmed schedules in Lifx App for my original 1100 W bulbs. Turn on with 30 minute fade in to 100% 30 minutes before Sunset : continues to work.
However, turn off with 5 minute fade to off at 11:59 pm just flashes lights with no fade to off.
Tried deleting and creating new schedule, makes no difference.
Using iOS 16.3 and iPad OS 16.3, but not HomeKit. Use Lifx skill with Alexa. Any suggestions?