I have the D3 in my 02 Envoy w/ bose and i'm starting to lose the left speaker when the volume is below about 12-14. When I turn it up, it kicks back on but it will go out again when I decrease the vol after a short while...any ideas?

Yeah... your problem is you have a Bose audio system. Those things seriously blow. Check all your connections (radio to bose amp, and also the connections at the speaker) and make sure they're solid.

You may also have a bad speaker. If the flex leads on the speaker are going bad, you can get that scenario.

I have D2 insatlled in my pathfinder with Bose. I am having the same exact problem you are describing. I just keep the volume high.. I am thinking something wrong with the bose interface that takes D2 output to a pre-amp signal for the bose amplifier.

im having the same problem in my Acura CL w/ a Bose sound system..WEIRD!

well im having the same problem with my D3 and i have aftermarket speakers, Infinity beyatch lol, for real, anybody know?

If you are losing audio from only a certain speaker at lower volumes, chances are it's a connection issue, or possibly a bad speaker. Most likely a bad or loose connection.