Oh joy, a possible incompatibility between devices! The obvious suggestion is to contact both manufacturers are see if there are any known issues, but don't be susprised if they each tell you to contact the other. Plantronics is probably the place to start, but it'll come down to how extensive their testing regime is or whether someone has reported this before. I've been using a G3 for a while and noticed some susprising app incompatibilities. It's not quite the same thing I know, but ...
Very slightly more related, I once had a Jabra headset that comprehensively crashed a Symbian Nokia. The replacement Nokia headset worked fine, though you'd say that Bluetooth is Bluetooth.
