We are having the same problem with my wife's Droid X since the latest update. I spent an hour on the phone with tech support Saturday explaining that I'd wiped the cache and done a factory rest...
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We are having the same problem with my wife's Droid X since the latest update. I spent an hour on the phone with tech support Saturday explaining that I'd wiped the cache and done a factory restore and still couldn't get 3g and only occasionally 1X. The tech said it was the towers that I was connected to. I also explained that my Droid X sitting next to hers had 4 bars of 3G goodness and he explained that I was on a different tower. We checked all of the settings and did another wipe with no improvement. He put in a trouble ticket for the tower and said that the problem would self resolve when we were out and about and switched towers. On Monday we went to work (same building) and to no one's surprise, still no 3G for her, but I had 4 bars. Called Verizon again and this time the CSR asked my wife if she was running Advanced Task Killer, to which she said yes. The CSR then told her that Advanced Task Killer had corrupted the SBF and that was why even after factory resetting the phone and with no apps installed, we couldn't get 3G. Advanced Task Killer (ATK) had killed the phone and there was no way of fixing it. I'm waiving the **bleep** flag and looking to some of the smart guys on this forum for an answer. I don't see any circumstances where ATK could in some way write to or corrupt the SBF. I think that my wife was being fed a line of crap, but I'd like to know what folks here think. They did offer to send her a refurbed phone, so I'm not going to root and manually replace the SBF.