I have a few issues with my SB and dock (some related to monitor order and DPI not sticking), but at this point the USB problem is the most pervasive issue I have as well. Basically, if I've ran my SB without being docked and I later dock it, sometime within
the next hour USB plugged in devices (and sound; I'm using my built in wifi so I don't know about ethernet) will drop out and come back a second later. Once that happens it continues, faster and faster until it occurs within seconds.
If I perform a reboot right after docking, or shut down the SB and dock, then boot, this problem has not yet occurred for me. The problem also occurs if I remove the screen and leave the keyboard docks, then re-attach the keyboard. That though generally
creates so much monitor instability that it makes this a secondary issue. ;)
As a sort of side note, there was a firmware update released today for the SB. I installed it, but the problem persists. The firmware update doesn't have a KB attached so I'm not sure what it was designed to fix, but not this. I'd also say unless there's
a really strange hardware issue affecting all docks, replacing the dock with a new one isn't the solution. I'm not really looking for a lvl 1 support type of reply to this reply, but hopefully someone further up the chain is monitoring and sees these messages,
and works to come up with a driver/firmware related fix.