I've experienced similar data freezes...
I have 5 bars of 3G goodness, but sometimes data requests fail to go through or just freezes in the BB Browser. Other times 3G disappears completely (despite strong coverage), and gives me an EDGE connection. I am running a leaked build, so I admit I didn't thoroughly test it with the original OS. Here's my phone build info, maybe we can find a common denominator:
Mexico 4, Line 23. Made 031109
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