Floodlight cam light stay on overnight

Floodlight cam light turned on without any motion detection.If I turned off forcely, it turned on automatically in 3 sec.In the live view mode and I turned off, It stay turned off but it turned on after I closed live view mode immediately.I already tried to change motion sensitibity option but it is not helpful.The only way is that disabling the motion detection lighting option but I want to use this option for my home security.I think that it is SW bug. Do you know how to solve my problem?