I have run into problems when I upgraded your HA coordinator's firmware to use Codebase 3.1.1. It causes the coordinator to go "deaf" for about 5 minutes in every 4 hour and 45 minutes.
It's very strange problem because it will occur exactly on clock every time. It does either not hear messages sent to it or ignores them completely during blackout. I used sniffer to see that messages are sent but there's no MAC-ACK. Ztc interface "normally" during blackout, and the chip give responses to commands, also it will send messages e.g link status.
This is not an application caused problem because I tested this also "vanilla" build, creating a sample coordinator with HA combined interface -template from Beekit.
This problem does not occur with older 3.0.11 codebase.