RDM10 as ArtNet-Node stop working when used in a large Configuration when send a global RDM Discover

I have a larger setup un my current production where i use 12 RDM10 as dual ArtNet-Node with about 300 Fixtues, when i send a Global Discovery via DMX-Workshop it can happen that some RDM10 stop outputing DMX or RDM, a Reboot is required