Hello Rojec,
thanks for your help.
I have the 512Buffer increased to maximum, no change, the same problem.
I have the power save function is disabled, no change, the same problem.
The general suggestions I have tried, no change, the same problem.
When I disconnected one of the two Denon 2900 and restart mixvibes, no problem. The music plays cleanly without interruption.
When I connect the second Denon 2900 the problems are back.
Ps. my English is not perfect, sorry