Floodlight won't reset, light stays on, can't connect wifi

One of my floodlights has lost the wifi-connection two days ago, lights came on and now stay on all day and night, and it will not enter setup mode. I tried just pushing the button, and nothing happens. I tried holding the button down for 30 seconds to reset it, and nothing. Just the spotlights staying on. I opened it up, disconnected the wires and reconnected it. The spotlights turned right back on, but i still can’t set it up. i didn’t have any problem setting up the other 3 cameras. What should I do?