Hmmm... I have a similar, but worse problem.
I have an IBlue GPS unit, which has been working great with Maemo Mapper on my n800 with OS 2007.
I then installed OS 2008, and both the Map application and Maemo Mapper have a very hard time keeping the Bluetooth connection with the GPS unit.
The GPS unit itself seems to be working fine (the led shows that it keeps the fix constantly, as usual), but both apps (I never use them simultaneously, I just keep testing both!) cannot keep the fix.
Map just says that the GPS signal is lost (contradicting the unit that shows a fix with the blinking led), while Maemo Mapper says that it lost the connection with the unit.
Anybody knows if OS 2008 changed anything significant about Bluetooth handling?

Thanks,
Massimiliano