I found another reason for ADA8000 sync errors: they can be caused by bad ADAT encoder ICs (Wavefront AL1401AG) in the device.
There are some production lots of this IC are sensitive to vibration (!). The error can be provoked by knocking on the ADA's main board in the area of the AL1401AG and causes a badly synced ADAT signal on the output. I know at least two people which can confirm this; the affected AL1401AG datecodes are 1038 (and maybe later), earlier production lots (e.g. 0846) work flawlessly.
Anyone here who can confirm this? I have working replacement ICs here, but if this turns out to be a common problem, we should first put some pressure on Behringer...
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