Can someone who can easily replicate the signal loss issue try this and see if you get the same results as me. Just go into settings and turn off 3G and then try to see if you loose the signal the same.
In the office here I get full 5 bars on 3G, if I hold the phone in my left hand I can get that to drop down to 1 bar in about 30 - 40 seconds. I don't loose signal totally due to the good signal here generally, but it's clearly showing up the issue.
If I turn off 3G I get 5 bars signal with edge showing, if I then hold the phone exactly the same I get no signal loss at all.
My thoughts are that the phone is not detecting the fast loss of 3G service and switching to the edge signal quick enough. Possibly due to the enhanced signal loss of this external aerial design, so a software fix to make it switch faster could be all it needs.
If anyone can get the same results it would be interesting...
Nick