Okay after some trial and error, I managed to set the network settings to a static IP for each of the cameras, and all is working again.  For some reason if this is not done the cameras lose connectivity and try repeatedly to reconnect.

So far it is stable.

EDIT: spoke too soon, one camera still drops off the network.  Other one seems stable.

  @Solla-topee Hello, thanks for the reply.

I checked both, and both are at -48 RSSI. Luckily the other camera has reappeared in the app, and I changed the IP to a different number to try.  Hopefully it will remain stable.  I got these cameras back in May, and they have been great out of the box and the previous firmware update that occured.  I'm not sure why the most current update destabilized things.

Edit:  I am using a different subnet on my wireless router so I wonder if that could be a factor.  I will try changing my router to use 255.255.255.0 instead once I'm at work and report back.

 After changing my router settings back to 255.255.255.0 the cameras appear to be working fine again!