Blink Cameras thru xfinity router

I have had Blink cameras working on my home wifi for well over 6 months. Then one day they stopped. I have done a fair amount of troubleshooting and still cannot get them to work.

I finally had to remove the cameras from the blink system to see if it would help. id did not. I keep getting the incorrect password error message. Called Blink for help and we factory reset a camera and still was not able to get the camera to work.

Support stepped me thru connecting a camera thru my phone hotspot, eliminating the xfinity router and it worked. So now it appears to be a wifi problem.

Nothing has changed on my home wifi up to this point. But here is what I tried so far.

     1. Un meshed xfinity router

     2. Created separate wifi networks for the bands, one for 5mhz and on for 2.4mhz. Also created separate passwords

     3. Temporarily disabled the 5 mhz band 

none of the above steps made a difference, i still get the invalid wifi password error message. Any help would be greatly appreciated