Companion LINK failure with Roon AIR

[audio_engr]

Stating the obvious, but... if the problem has only started to happen since you replaced the link cable, perhaps the new cable is faulty or not working to the specification required by the Devialets (perhaps possible since I think you said it was custom-built).  Have you tried putting the original cable back to see whether the unplayable albums then play OK?  That would seem to be the first step to try.

Is there a common factor in the unplayable albums, such as the sample rate?  Maybe the new cable works at lower sample rates but not higher?

Thanks for your suggestions. I'll try out all the things you've mentioned and report back. 

Also, I was wondering if the 72V DBS of AQ Diamond was interfering with the LINK ?  Is there a way to bypass DBS I wonder ?