My experiences seem similar to yours: The device go offline (and registers as “malfunctioning” per ADC) and comes back online either on its own with time and with no action, or simply by manually locking/unlocking, which immediately and consistently wakes the device back up and has it successfully started communicating again
Locks are operating in a power save mode as battery operated devices. It is not uncommon for them to be affected first with supervision errors, but this is definitely odd for a specific device type to cause it, and especially since the lock doesn’t appear to be using the new meter (or any other device) as a repeater.
Your network map seems odd, with further devices having stronger signals than a nearer one, in fact used as a repeater.
If you have not already tried it, before the battery, try power cycling the panel. I’m curious if a panel reboot might result in a different network map.