A few weeks ago, my outdoor plugs KP400 would turn on at desk as I had set them, then would turn off about 15-20 minutes later.  I would manually put them back on and they would stay lit until the time I set them to shut off.

I had used them throughout October for a Halloween display with no issue.  I had some lights up during November when this started happening.

The issue also seems to affect my indoor smart plugs (KP125) as well.

I tried removing the devices and adding them back, and it still occurs.  I tried syncing the plugs and the issue still persists.

I also have two smart bulbs (KL125) which do not seem to have this issue.