Iphone 3GS 4.3.3 reverts to 2G during phone calls then stays in 2G !!!

Hi there
I'm using iphone 3gs 4.3.3 and when I make a phone call, even in a full 3G signal area, my iphone reverts to 2G and then stays in 2G after the call. It doesn't go switch back to 3G.Why is this ??? Even hours later the phone is still in 2G.
Also, there is full 3G coverage but the only way is to force it back, either by switching off and back on OR going into airplane mode and back.
Anyone else experiencing this problem ?
Using O2-UK, West Yorkshire
Thanks and regards

Anyone ???

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