Wired floodlight repeatedly turns on/off randomly during night with no trigger motion

My floodlight keeps constantly coming on and going off every few seconds/minutes throughout the whole night but there is motion to trigger it and nothing is recorded. I can look at the app to physically turn the light off and then see it switch back in again. It’s just started doing this for the last 2 weeks. Not sure if coincided with software update?? I’ve cleaned around it, I’ve turned it off from mains and back on again but it still does this. Can anyone help? My neighbours are going mad with me!