I am interested as well - as I am having the same issue and find it quite annoying. I get it if there is no sound and a power-saving mode is activated, but I can't stand that I have these playing in the background (at a low volume) and they constantly turn off.
DM-40 Power Off at low volume
My DM-40 speakers power off when playing at low volume. I suspect this is due to a power saving / stand-by feature.
How do i turn this off or stop this from happening? As a monitor speaker the ability to listen at differing volumes, especially for producing soundtrack and ambient music, is crucial. I can't have them cutting out after 10mins every time