Z61m Bluetooth

Hi, I have the following problem with the internal bluetooth of my
> Lenovo Z61m laptop:
>
> When I boot my system, bluetooth works fine (I can see devices, can
> join a personal area network, can send files,...)no problem here.
>
> But everytime after a couple of minutes my bluetooth connections drop
> and it is impossible to reconnect to another bluetooth device.
> (the other bluetooth devices and computers are still working, only my
> Lenovo Z61m stops seeing bluetooth devices)
>
> I can't see anything wrong in the control panel nor bluetooth devices
> or in the taskbar or in the manage pane (bluetooth device is working
> properly)
>
> I can power on and power off the bluetooth Radio in Thinkvantage
> Productivity center but nothing changes.
>
> All latest updates are done via the Thinkvantage Productivity center-
> Update my system.

I have tested bluetooth with the Lenovo System Toolbox (no problem found
there)
>
>
>
> My configuration is as follows:
> Lenovo Thinkpad Z61m - 9459HAG
> Microsoft Windows XP Pro SP3
>
>
>
> If anyone could help me solving the problem I would be most grateful,
> gabriël