1. the game occasionally starts up without any sound or
2. after the DAYZ logo there is a timeframe where sound is played and then it vanishes or
3. the game starts up with correct sound and when switching to the desktop, remaining there for several minutes and finally switch back there won't be any sound either.

my speakers are wavemaster cube mini which detect incoming audio signals and will automatically switch to the right operating state (on/standby). I can see that my speakers switch to or are on standby when one of the scenarios mentioned above applies. I also have to mention that i have these issues exclusively with DayZ and so far with no other game or type of media on my system.

sound card: asus xonar u7