I would not say it is the fault of the headset but the fact that it is different and the patch is just on the edge of working. The patches seem more stable on PPC-6601.

I'm almost tempted to go back to 3100. On 3100 it really stayed locked on to the headset. On 3500-124 sometimes if it's been idle a while it puts up a headset Icon with a "?" in it. I think this Icon means it is Scanning for headset. When it does this it takes a few seconds. With 3100, I never saw this and it instantly always connected. But maybe 3100 drains battery more. I don't know.

If someone wants to experiment one evening via IM I can tell you some stuff to try. But be prepared for lots of hard resets and a long night with possibly nothing fruitful out of it. But you might get lucky too.