Same issue. Started on my PowerSpec G410 after upgrading from Vista to Win 7. Had no idea of what the issue was for months. Simply rebooted to clear. Then moved my Companion 5 speakers to my car race simulator PC and the sound drop issue followed. That
PC was upgraded to Win 7 same time as PowerSpec.
Striker's suggestion to disable Network Adapter worked. I thought. I disabled my D-Link DWA-552 XtremeN and the sound remained on for longer than I can remember - about 12+ hours. Then I went back in and disabled the Realtec PCIe GBE Family Controller
(lan card). And thusfar the sound hasn't dropped - been one day. But I'm sensing the conflict is as Striker points out with the Network Adapters. Disable and see if that doesn't resolve your issue.
That doesn't help with networking since there will be none/no internet either. For my situation the pc only needs to connect infrequently. So I'll enable and disable as needed until a fix is out.
Contacted Bose tech and directed them to this webpage - they will and send to their testing engineers. Like some comments above, Bose doesn't seem to think there is an issue. But there is: Windows 7 - Bose Companion 5 - Network Adapters; together do
not like one another...
Thank you James.
post comment update: after 2days of testing I'm afraid the sound drop isn't completly eliminated. Disabling the adapter cards makes a definite improvement with lengthening the time between drops. Whereas with the wired and lan cards enabled the sound
would drop anywhere from 1 hour to maybe four hours of play; after disabling the sound has continued for 8 + hours (i've had two drops since my initial comment with almost continuous play). There remains something with the USB interface and windows 7 driver
for music.