Basically the same system I use. It occasionally disconnects for some unknown reason but automatically reconnects after a few seconds.
Mine has the option to Auto-Redial upon disconnection, but I find I sometimes have to re-Boot the Modem after it disconnects (unplug and re-plug the USB connection)....
Its annoying when I am half-way through doing "something": Turning pages, Posting, Videos, On-line Multiplayer, etc...
Google: Disconnection: Its a common fault with UK Service Providers.
Paul...an occasional Sink Plug... 8-)...!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.