Z Wave JS - failed to connect

Hello together,
since about 2 weeks my z wave js integration ist not working anymore. I use this integration together with the z wave js ui add on.
In the past everything was running well and I did not change anything in the system in the last weeks.
The error message from the z wave js integration is:
Failed to connect: Cannot connect to host a0d7b954-zwavejs2mqtt:3000 ssl:default [Connect call failed (‘172.30.33.0’, 3000)]

Can anyone help me? Where to look or what to do?
I thought about deleting the add on and the integration and reinstall both from the beginning. At the moment I have only 3 z wave sensors running. But before I want to exclude and delete these 3 sensors correctly from home assistant and I cannot do this because I cannot exclude the in z wave js becaue the integration is not running…
Thanks in advance for your support!