Both eufy cameras are offline

Dear friends, from this morning (or maybe last night) my cameras are offline, I have tried the instructions to press the Sync button to make it online but failed, I have also tried to remove and add it again but also failed. I have to mention that the firmware was updated yesterday. What can I do? Thanks in advance for your help.

I have a similar issue. Both of my doorbells and my furnace and AC are connected through the same circuit. When I first turn on the AC circuit, both doorbells works fine, but the minute AC or heat comes on, one will go offline. I replace the old transformer the only provide 16v/10va with a 24v/40va and all are working.

i found pluging in the battery cameras and literally shaking them wil lwake them up