3G/H problems

[pcbms]

Anyone having problems getting a gsm/wcdma connection? My phone worked fine for months then recently (after updating to 2.2) I can end up getting no signal - I mean nothing, no bars just an x where the bars should be. If I change the network mode to gsm then its ok but obviously then internet speed is crap. I did a hard reset and that seemed to fix it but only for a day - thought it might have been a Vodafone issue but they saw there's no network issues. Anybody having similar problems and know of a solution?