outdoor spotlight cameras issues

My spotlight cameras outside lose the WIFI connection, I purchased the Eero Pro with one beacon and they still lose the WiFi but not as often. Also, the picture during the daytime on the cams is as clear as can be, however, at night time, the picture has light colored circles all around it, not sure why this happens? The round blurry circles only happen at nighttime and they appear whether the light is on or off. Please help with a solution.