Is that IP for your unraid server or the MQTT Broker? If you have the MQTT broker configured (you can see the devices that are configured in the UI, in the "burger" menu on the left, under manual config, if the MQTT broker is there hit delete and that should remove that from being spammed)
If the device is your unraid IP though that could mean the api is struggling to communicate with it, are you using HTTPS, is the docker bridged or does it have its own static IP?
Finally I have fixed the bug that caused it to crash when stopping the array - if you update it should be working