In the last couple of weeks, I have been experiencing a similar problem and I'm curious to know whether I'm alone with this. When I experienced connection freezes late last year resolving the issue required me to do nothing more than disconnect and reconnect, but this time it appears to be necessary to disconnect, unplug the USB cable, reconnect the USB cable, run Vodafone Mobile Connect, and run Internet Connect again to reestablish the connection.
I'm beginning to suspect a hardware fault because I've noticed my Vodem getting quite hot; much hotter than I would expect a cellular radio transmitter to get under normal conditions. Any thoughts?