[Ale]

Nice
I have the same problem! The problem is in PT10, 11 and 12
I am also on 10.9.5.

I stopped researching on this problem and stopped contacting avid support on this problems couse they have no ideas beside replacing the hd native card.

Digitests reports no errors.

It all started when I replaced my 6core mac to a 12 core mac.
The first weeks all was well and then suddenly the hardware was not seen anymore. I did not find a way to fix this. I have done all tricks.

The only fix is to restart the mac a second time. In rare cases a third time.

Then I normaly start my day with loading the core audio manager manually. Just to see if he finds the card. If the core audio manager crashes I know thre is a problem and I just restart my mac and after that narmally all is back to nornal.

I know this no help/solution.

Alex