I have the same problem. Running Nuendo 7.1.20 on a MBP late 2013 (2.3GHz i7, 16GB Ram, 500GB SSD, NVIDIA GeForce 750M/Intel Iris Pro graphics) with El Capitan, 2 Metric Halo ULN-8s as an aggregate device connected via FW400 to TB adapter. There’s about 50GB available on the SSD, which is enough for what I need to do.
When test recording 10 tracks at 24bit 192kHz, Nuendo throws up a warning and stops recording after about 2 1/2 - 3 minutes, regardless of audio buffer settings, with no other apps running. Recording into the Metric Halo MIOConsole Record Panel works flawlessly for up to 30 minutes (longest test I’ve tried so far), and a colleagues older laptop running ProTools 11 works fine too, hardly breaks a sweat, and that’s recording to a spinning drive at 5200rpms. My laptop with an SSD should hardly even register, but I see Disk overloads on Nuendo’s “System Performance” window.
Since we may need to do a few overdubs (live in studio recording starting next week), I need to use a DAW, else I’d just track into the MIO Console Record Panel.
I searched around and see that on Windows the NVIDIA graphics cards cause problems, I don’t know if that applies to Mac as well.
Does anyone have any ideas as to what might be the problem, and more importantly what I can do to fix it?