I’m also experiencing the same issue. Noticed it a while ago but as the floodlight is on the side of the house with only bathroom windows I don’t see it often.
Sometimes the light goes back on every 3 or 4 seconds after it’s just timed out. Luckily only my neighbours gardens are affected but this is pretty poor!
I’ve reduced the distance to minimum and like everyone else I have no motion detected, nothing visible on camera but it still goes off! Terrible!!