Posted 25 August 2010 - 10:11 AM
I have the u720 and it has been driving me crazy. Mine is plugged into a Kyocera KR1 router and the router keeps a log. When it cuts off the error in the log is "connection terminated by peer". I assume this means Verizon is throttling the connection. I don't think it has anything to do with you or your card because I have used many cards and configuration and this happens at least once a day. What is your transfer rate, per month? They told me mine was 14gb per month (and that was a light month) and the guy at the store indicated that was a lot, so it wouldn't surprise me if throttling is the culprit.
The only other wildcard I can think of is if you are on a fringe coverage area like me the signal dips out sometimes. I don't know about the card you have but the U720 has a dual band antenna that is worthless indoors. I get full bars on clear, sunny days, but if it's overcast or stormy I get three to zero bars.
Hope this helps, good luck!