Radio 1.59.42.15 and GPS issues

[Ryplok]

Radio 1.59.42.15 seems to play havoc with Destinator

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After upgrading a Polaris to the most recent HTC Official WM6.1 ROM (Portuguese) I started having problems with Destinator 7.
The device detects the GPS signal and then loses it every 20 seconds or so. If you go back to the GPS settings in Destinator, you see that the GPS Antenna is OK, with 7 or satellites, and then you go back to the map and it works for a while (another 20s) before it loses GPS signal again.

I tested this on 3 HTC Cruise and it is always the same.

I tried upgrading the radio but that didnt work because Radio 1.64.xx.xx doesnt seem to work on this ROM (no sound on calls, poor GSM/3G reception).
I also tried Radio 1.58.21.23, and that still gives me problems with GSM/3G.

Here is the info on the HTC ROM
R 1.59.42.15
G 25.69.30.05H
D 3.13.00.00

Has anyone been through this and found a way out?

Thanks
Andre