Spotlight camera issue

I have three of these spotlight cameras. Two work fine but one keeps stopping taking pictures. The camera will record but the picture is either Black or extremely pixilated to the point that you cannot see a thing. Today the camera just stopped all together. This is the one camera closest to the router so it makes no sense to me at all. I believe it to be a defective camera but everything tells me to reset my router... the helpCommunity just keeps taking me in circles of everything I have already tried to remedy the issue. After deleting the device and reinstalling it I can only turn the lights on and off. Nothing else matters to it.