This issue occurs for me, off and on. There was a string of others with the same problem posting on the other site with no resolution other than deleting the app and starting over. This time it’s persisting and I’m away from my system running only on inverter mode in a hybrid system now without grid service.
Sounds like your internet connectivity is powered from the grid?
Actually the cerbo is on an Ethernet cable and supported by a UPS.
Correction: the cerbo is powered by the battery 24v pack and the router is backed up by a UPS.