Bluetooth Headset under WinXP Pro

Hello,

under WinXP Pro with SP2 (same problems under SP1a) I use the SE headset
HBH-35 and a bluetooth dongle from Epox called BT-DG02A with the Widcomm
driver 1.4.2.10.
File transfer and synchronization with my SE T68i work pretty fine without
any interrupt in the connection, but when I use my the headset the
connection is very unstable. This problem occurs sometimes at the first
connection with the headset or (most times) after a short and non equal
time. The symtomes are:
- Sound comes (although the audio I/O ports under WinXP are switched to
bluetooth by the Widcomm driver) from my soundcard
- the symbol of the Widcomm driver is still green and the headset is still
correctly paired and activated

The problem could be solved by disconnecting the headset by pressing the
connection button and -after a short time- reconnecting it, but as you can
imagine this is not very comfortable when you are using the headset for
voice chatting.

With my SE T68i the headset works perfect (tried for at least 70 minutes
;-))

Can someone help me by posting a possible solution? I would be very grateful
!

Thanks
Thomas