Signal loss after updates 4.3 & 4.3.1

Just wondering if anyone else has had signal problems after the latest round of updates? Never had a problem before at all, but now it's showing the network connection lost & no service on a regular basis, all in areas where I've had no issues in the past. Tried reboot few times, no effect. Could be a massive coincidence that the network may be having problems, anyone from the UK on 3 confirm this? Cheers

Exactly the same problem, on Three U.K.
It's not the network though - I have two iPhone 4's sat next to each other - one upgraded to 4.3.1 and one still unupgraded (and won't be until this is fixed).
No signal in most of my house, and even when I get a brief one bar calls drop.
Have tried all the obvious :-
1. Full factory reset and set up as new iPhone.
2. Tried swapping SIMs - problem stays with 4.3.1 phone.
Looks like the new baseband is broken or at the very least has been set to consume less power hence not enough power to it.
Very disappointed.

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