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If it’s really random then I would contact support… they will probably need the event logs of both systems.

You can already check:
that the cards are fitted well (fysically),
that the system shows that they are present
that no errors are shown.
that the routing (direct out to dante routing, on the GDL input source is dante) remains correct…

Ah also check the clock master settings. Dante in iLive should slave to the iLive mixer. The GLD has to have Dante as the master clock and slave to that. Also check that master settings on the Dante network are correct using Dante Controller. Dante in the iLive should be preferred master.

Definitely make a “patchbay only” scene on both systems for this setup.

just my 2 cent

IDR32, R72, Dante, Mixpad
laptop, TP-Link TL-WR1043ND