The BES sends messages to the wireless network for delivery to the device. If a response is not received from the device for 5 msgs in a row it will stop sending to the wireless network and queue on the server. The 5 messages out on the network are just in the ether in limbo looking for the device to deliver to in the meantime.
Your device is probably losing the association with the wireless network even though you have a good signal, it cant route msgs to the device. Thus the BES gives up and goes into a retry state. The retry just happens to be every 4 hours, so if you see msgs coming in after 3-4 hours then you know the association was lost for a time, the BES started queueing, and the device then picked up again during the 3-4 hour interval and got the messages on the 4 hour retry.
We used to have this issue w/ T-mobile and sometimes they had to reset the "tower status" or something on their network however I haven't had this issue too much lately. It mostly happens with people with a poor signal, those who go in and out of coverage, or those who go home at night who don't have a good signal at home and then have to wait a few hours for msgs to retry delivery in the morning while in good coverage. Hope this info helps.
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