FloodCam issues

It seems like my floodcam wired only connects when I am right underneath the camera and would connect for at most one hour and gets disconnected.I talked to the Ring Rep and tried all types of procedures1) Connected on 2.4ghz / with good wifi signal as well as 5ghz and since modem is about 6 feet apart where camera is with few drywalls between, device health has been great.2) Tried other Floodcam thinking it's defective, still same issue.3) Rewired, still same issues. Tried electricity pen and seems all the wires are hot except the ground.4) I have a wired doorbell and it never gave me a problem with connection where the modem is sitting between the bell and camera. 5) One thing I've noticed that was the breaker to the camera also controls our kitchen ceiling lights and the lights seems to be flickering time to time. Bulbs are LED and fairly new with few months old (60W). I don't see any loose feelings on the breaker when I flip the switch.6) Since the WIFI channels were mostly occupied with 6 and 12, I put myself on channel 5 to see if that was network interruption. Which it didn't seem to change anything. Any suggestions I could try?