We have noticed in our environment that if a BB goes out of coverage and then it comes back into coverage sometimes it doesn't re-register back on the wireless network. Even though it appears that it has (GPRS or NXTL are showing). I have went rounds with the wireless vendors and RIM and it appears it is just a flaw in the devices. We have not experienced this issue in a little while so maybe the newer handheld software code fixed this but I am not sure. But we had to do a hard reset on the devices to get them re-registered and the emials started coming through. I am not sure if this is the same issue your experiencing but it is worth looking into at least. Hope this helps.
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