vrnetlab waiting for provisioned interfaces to appear.

[netomat]

Aloha,

I created a lab with 19 router.
8 Huawei Ne40 version 8.23 as vrnetlab based router
and
11 Cisco XRd

When I start the lab it takes very long time, until the all vm based router are started.
But sometimes it can happen, that one VM Router does not fully start.
When I try to stop and start it from clab cli it starts again, but then the status is:

... waiting for provisioned interfaces to appear.

So it looks that the interfaces are missing or cant be connected again.
Also I cant connect via ssh or port 5000 to the console.

question is:
Where and how could I troubleshoot this?
I have no idea in moment :-(

Thanks
Marcel