Logic X audiodropout with MOTU 828 X

Machine: Macbook Pro 2,5 GHz i7, 16GB Ram, 512Gb SSD. Oktober 2014
Software LOGIC X
System: Mavericks, Yosemite
Hardware: MOTU 828 X, MOTU 8pre USB
Kabel: Thunderbolt, USB
Hi, I'm experiencing audio dropout when running the setup listed above. The dropout is not reproducible - sometimes the system runs for hours without a single dropout - then again sometimes I get dropout every 5 seconds.
- before replacing my 2009 Macbook with the 2014 Macbook I connected the same MOTU hardware via USB running OS X 10.8 and everything was perfect.
- Then I upgraded to OSX 10.9 and audio dropout started happing.
- I changed to the brand-new 2014 Macbook. Same problem
- I upgraded the new Macbook to OS X 10,10. Same problem
- On the MOTU Interfaces the firmware is the latest version 1.04 and the audio driver is the latest version dating 17. October 2014
- Even with older drivers and firmware always the same problem.
- No fusion drive on my Mac
- very occasionally the dropout problem even occurs when using the the onboard sound hardware while using Logic X
Since the audio dropout problem occurred on 2 different MacBooks and only started when I upgraded from OS X 10.8 to 10.9 I guess it is a:
1. MOTU driver / firmware problem
2. LOGIC X problem
3. OSX problem
Since I need my Mac for professional audio work I really need a solution to this problem. Even MOTU / Germany has no clue.

Hi Sascha..
I remember you.
If you have Firefox running that's another CPU hog that can cause dropouts.
I stuck with Snow Leopard and Logic 9, great combination, there will be no further Mac purchases or upgrades for me.
Also still have my quad-core 3.0gHz PC which runs Cubase 6 very well, it keeps me compatible with the University/PBS machines running Nuendo.

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