Hepl with TomTom Plus Service and T-Mobile MDA

[ajsasr]

I just turned on full internet so I could use TomTom Plus on my new Go 720. It works via the GPRS and DUN to talk to TomTom servers. I have one problem I can't seem to resolve. When I try to use the web after or during using the Plus service, I get a message telling me it can't connect until I end the current call. It seems like the connection to the TomTom isn't ending, and I have to press the hang up button for the internet GPRS to work. Anyone know about this or how to fix it?