Domintell integration stops working after a couple of hours

I’m using the domintell extension from https://github.com/shamanenas/has_domintell
I have a working setup, at least it works for a few hours. I can control my domintell lights from Home Assistant and Apple HomeKit.

But, after a few hours (not a fixed time, sometimes it runs 2 days) it stops working.

When I try to change the state of a light, it does not respond (and jumps back to the old state, often not in sync with reality).

It is not Home Assistant that stops working, I can still control my airco which uses the melcloud integration.

Still hoping for some help here.

I found in the logs that the integration stops working after this message:

2021-03-14 08:48:32 WARNING (MainThread) [homeassistant.components.websocket_api.http.connection] [547984631792] Disconnected: Did not receive auth message within 10 seconds