Maxcube stopped working in March 2021

I have been using maxcube for sometime with no problems.
During March my entities disappeared.
I am running hassio in aVM in Ubuntu 20.10
I also use a Rpi to switch my boiler and for data logging my heating through a web interface.
This all stopped working.
RPi pings the cube every 2-3mins for updates
The only way to get it working again was to remove the maxcube: configuration from the yaml file.

Where do I go from here?