Bluetooth & 1.72 ROM once more - MDA II, XDA II, 2060 ROM Development

For some days now I have this strange behaviour of Bluetooth GPS.
At first I had the 1.72 OS ROM together with T-Mobile 1.60.36 Ext ROM. After some fiddling around I got it all working.
Major setback: Not being able to use GPS via any com port
TomTom3 WAS able to connect via 'Bluetooth GPS'
To get by this last issue, I dropped most of the 1.60.36 Ext ROM. Basically I took the non-norwat-specific parts of the QTek 1.72 Ext. ROM and I added the T-Mobile customisations. I specifically did NOT use the "OEM_WWE_03120301.sa.CAB" from the old Ext ROM (as this changes the old T-Mobile 1.60 ROM to make it work a bit with bluetooth) but I used the "OEM_WWE_04051001.sa.CAB" instead.
The effect is that occasiuonally (differs from once per hour to once per 5 min) TomTom3 seems to freeze in Navigator mode. Apparently the GPS NMEA datafeed stops. Just exit and re-enter TomTom3 gets it working again.
I do not see any behaviour like this when I just keep a GPS Viewer running instead of TomTom3, which means there is nothing wrong with the GPS nor the Blkuetooth setting.
Switching to/from NMEA - SiRF doe snot make a difference.
I suspect the TomTom GPS to be the bastard here. . . .
Contents of my config.txt:
EXEC:\Extended_ROM\TPDisable.exe
CAB: \Extended_ROM\CameraRC132_WWE_1.5.sa.CAB
CAB: \Extended_ROM\MIDI56.sa.CAB
CAB: \Extended_ROM\CallerIDB31_Hima2_WWE.CAB
CAB: \Extended_ROM\MMS1.6.0.14WWE.CAB
CAB: \Extended_ROM\GPRSMonitor_WWE.sa.CAB
CAB: \Extended_ROM\ClearVue_WWE.sa.CAB
CAB: \Extended_ROM\TMD_AP_NL.sa.CAB
CAB: \Extended_ROM\TMCOMREG.sa.CAB
CAB: \Extended_ROM\TMD_NL.sa.CAB
CAB: \Extended_ROM\OEM_AKU1_WWE_4AP.sa.CAB
CAB: \Extended_ROM\OEM_WWE_04051001.sa.CAB
CAB: \Extended_ROM\VideoMMS.sa.CAB
CAB: \Extended_ROM\Broadcast_WWE.sa.CAB
CAB: \Extended_ROM\3_networkname.CAB
CAB: \Extended_ROM\Version_172_900.CAB **
CAB: \Extended_ROM\itibm.ARM.CAB
CAB: \Extended_ROM\TMDNLCustomize.sa.CAB
CAB: \Extended_ROM\TM_phone_class10.CAB
CAB: \Extended_ROM\CheckNotifications.CAB **
CAB: \Extended_ROM\ExtendedROMUnlocker.CAB **
CAB: \Extended_ROM\RegEdit.CAB **
CAB: \Extended_ROM\WM2003 Dialer skin.cab **
CAB: \Extended_ROM\T-Mobile Registry additions.cab **
EXEC:\Extended_ROM\TPEnable.exe
RST: Reset
Lines marked ** contain self made/modified CAB's
CAN ANYONE give me a CLUE on what might be wrong here?

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FOUND IT
Issue was with the SD card performance.
NOTHING wrong with Bluetooth, the DCONNEX BT GPS, 1.72 ROM, Extended Rom . . . .
See new thread:
http://forum.xda-developers.com/viewtopic.php?p=52965#52965
(I started a new one because the cause is not specific for TomTom)