Is there any way to remotely reboot the panel? Anything else I can to to troubleshoot or fix this remotely?
To send a command to remotely reboot the panel either cellular or the backup broadband connection would need to be working. When both are down commands cannot be sent to the panel.
In this case, looking at the firmware version reported by the panel and the trouble conditions, the first thing to do to resolve this is update firmware to the latest version. Recent updates have improved the cellular radio connectivity after a power loss, specifically.
You can apply the IQ Panel 2 updates via SD card if it cannot connect to wifi and get a broadband signal locally. Steps are in the link below: