[MorganMcRaeMusic]

I have tried everything to fix this problem. I have alternated the cables, done different configurations of my Digidesign 192s into my core card. We even thought it might be a problem with the Core or Accel cards themselves, so we replaced those, and successfully ran Digitest to show that there were no problems there. I am running iOS 10.9.5 and Pro Tools HD 10.3.7

PROBLEM:
A couple of weeks ago, in the playback menu, HD TDM was suddenly not listed as an option, so it defaulted to Pro Tools Aggregate. I thought perhaps I had forgotten to turn my Digidesign 192s on, which was not the case. I found this strange, so rebooted the computer. Same thing. HD TDM was NOT listed as an option and it defaulted to Pro Tools Aggregate.

THE STRANGE PART:
Every once in a while, HD TDM DOES show up and I can run my sessions like usual. Thinking that I've fixed the problem, I try to reboot so that I can ensure that my system is now magically fixed and I can reliably book clients. Upon reboot, HD TDM sometimes shows up, and sometimes does not. It defaults to Aggregate in this case.

I don't want to book any big sessions at my studio until I can reliably boot the program using my HD rig. This is because I might be screwed (and have angry clients) if Pro Tools were to stall or crash. Then I would not be able to reliably bring the program back up using the HD Rig, as it might default back to Pro Tools Aggregate for the next two days (or however long).

I've talked to several Avid technicians who have tried unsuccessfully to fix this problem. Anyone have any ideas?

Thank you in advance.