New 3 Iphone4 signal loss May 2011 UK

Hi
I just bought a brand new iPhone4 from 3 in Brighton, UK (Sat May 7th 2011). I had put of buying the handset for some time following stories of signal loss from holding the phone.
I asked the sales rep on Saturday if there are still issues with signal loss on the iPhone 4. I was told the problem had been fixed some time ago.
I have 3 bars of signal on the phone. If I hold the phone with 2 fingers, 1 on either side of the phone, about half way way up the phone (not touching the bottom), my signal drops 3... 2... 1... and then after about 20 seconds. No Service.
If I hold the phone as any right handed person would, bridging the gap in the band, the signal drops rapidly 3,2,1 No Service.
I was in London on Sunday and couldn't make a call without losing the signal. The friend I was with has an iPhone4 on 02 that doesn't seem to suffer the same problem.
I've had a quick look on youtube at videos uploaded by people with the same problem, and it seems my drop in signal is far worse than any on there. All of the video are from last year.
I don't want to use a "bumper", which is why I put off this purchase for so long.
Before I return the phone to 3 and cancel, I just wanted a clear answer to weather the problem has actually been fixed and I have a faulty iPhone4, or weather I have been fed a line by 3 staff?
Many thanks
Mr M

Just got a replacement iPhone4 from 3. Exactly the same issue. Tried using the bumper, which makes no difference. Actually, if I don't touch the phone, I get 3 bars. If I add the bumper and then don't touch it, I get 2 bars. If I then try using it even with the bumper, the signal dissapears too, after about 20 seconds.
Am I going crazy here?
If I hold the phone with the sides, not touching the bottom antenna, I get exactly the same thing.
Am I the problem? My skin conducting too much static electricity somehow?

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