Data network errors when manually switching from 3g to 2g

Hi everyone,
Apologies if this has been posted before but im running out of ideas! - Got my iphone 4 a couple of weeks ago and have noticed a rather irritating problem with it. For some reason, if i manually switch from 3g to 2g the data connection drops.. I get 'cannot activate cellular data network' errors and i have to toggle airplane mode on/off to reset the connection. Is this a network issue? - I live in London and am with Vodafone... Their tech support are useless as all they suggest is resetting the phone or getting it replaced. Its my third handset in 2 weeks and im getting close to calling it a day and sending the phone back to Apple. Anyone out there in a similar situation? - Advice??

Bump
So no-one has suffered this issue? - Not even fellow vodafone uk users?

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