Sorry to hear about this, @KungFuSu! Our Floodlight, Spotlight, and Smart Lighting devices are not designed, nor do they feature any option for flashing lights. This flashing light certainly sounds like a possible device installation or power concern.
As long as your Floodlight Camera is online and connecting with an efficient wifi signal, the lights should be able to be controlled via the Ring app. If for some reason the manual lights toggle in the Ring app does not work, please attempt a live view from the app to see if the video connects. This will confirm whether the device is online, or offline.
Should this lighting concern persist, we recommend flipping the breaker switch, or a light switch, to briefly remove power from the Floodlight Camera. Once power is restored, these lights should not flash. Please ensure there is not a dimmer or any other type of specialty switch wired to control the Floodlight Camera, as this could interfere with powering the lights.
If this concern is still persisting, it may require a more in-depth look from our support team. As the Floodlight Camera uses high voltage for it’s operation, we recommend contacting a licensed electrician for troubleshooting any power variables. The electrician can even help further with contacting support if necessary. Please give our support team a call at one of the numbers available here. We’re taking additional steps to protect our team and help reduce the spread of COVID-19, so this has resulted in longer than normal wait times. If you are outside of the US, please read our response to COVID-19 here to see how to contact support.