And do you use a special driver for this DAC ?
Is it still true that this counts for KS Normal Mode as well ? (I recall that somewhere along the lines I read that Normal Mode just worked ?)
If so (not working as well) we must concentrate on the buffer size you apply to the DAC via XXHighEnd. The very best would be to continue this all with Normal Mode, because it, well, is normal. So, set the Device Buffer Size in XXHE to what you expect the DAC's buffer size is and next try some extremes for Q1. I know, you did something like this already, but it should influence the length (the boundary) of those tracks which do and do not keep on playing it it indeed is related to the buffer size ...
As mentioned previously normal mode has the same problem as Special mode. Only Adaptive mode works but the sound quality is signiticantly inferior and not worth the trade off (sonics versus being able to play multiple files shorter than 8 minutes 41 seconds).
I did play around extensivbely with the buffer settings and Q1 settings yesterday (I spent several hours just on that) without success, so I don't think there is any value attempting that again.
I have not tried the garbage collection SFS 2 thing yet. I will try that now.
The DAC does not have a proprietary driver and I am just using the standard Microsoft one (i.e "USB Audio DAC" under Device Manager).