Remote z-wave not working

Hello, if a reboot did not help, the next step I would try is an extended power off.

Settings > Advanced Settings > Power Down.

Leave the panel powered down for at least 20 minutes. Allow a few minutes after booting up to try running another cell test.

Upgrading firmware would be next step, if your panel can communicate with the Qolsys software server still, you can follow the steps here.