I'm having the same problem as well where my volume fades in and out during calls. It's on landlines and cellphones for my wife and I. When I press the phone like hard on my ear, it's as if it fixed a loose wire in the speaker part of the phone and the volume comes back to life. When I'm not pressing, the volume goes away so it's as if there is a loose wire or part in my phone.

But since many of us are experiencing this, does this mean it's faulty hardware on all of our N900's? I mean what do we do at this point as some people have said reflashing didn't fix the problem which is what I was about to do.