Cam v2 keeps losing connection,

I have three Cam v2 set up, recently each one keeps losing connection. I un-joined the BETA program to eliminate that as a possible cause- same thing happens. Cams will run correctly for approx a minute or two, Stream resolution setting makes no diff, 32GB SD card installed in all, averaging about 50kbs data stream, then Cam will lose connection. Cameras are grouped in one group in the app - shouldn’t make any diff. Connection error code: -20018 Cams will not re-authenticate or connect automatically. Any known resolution or cause of this error? Sometimes the connection failure error is code :-27