I just upgraded to a 4G modem (Novatel USB551L), and find myself trying for up to an hour on most days to finally get a connection. More specifically, the modem connects, but only sends and never receives, making the connection useless, because nothing will load. I disconnect/connect for 20 minutes to an hour, before I finally have success. This never happened to me when I had the 3G modem.
Any ideas?