Soundchannel is null when loading Sound.play

Hi!

I have a strange behaviur on one of my Apps on Windows. The APP is used a hundred times and more. But one customer is telling me that the APP is not loading.

I figured out that when playing a sound the result Soundchannel is NULL.

baseTrans.volume = Vol
baseChannel = baseSound.play(0,99999999,baseTrans)      //starts the sound

why is the baseChannel = Null. I saw some articles stating, that there maybe problems with the sound card, but the device Manager is showing, that all the drivers are ok.

The Problem occurs just on this one Desktop with windows 10

Please help

Michael