Thank you James,
This has helped.
We thought that site were plugging a USB dongle into the router as we get logs like such;
08:23:32, 08 Feb 2016,ASY 10 assigned to usb-1-1 (Globetrotter HSUPA Modem)
08:23:32, 08 Feb 2016,ASY 9 assigned to usb-1-1 (Globetrotter HSUPA Modem)
08:23:32, 08 Feb 2016,ASY 8 assigned to usb-1-1 (Globetrotter HSUPA Modem)
08:23:32, 08 Feb 2016,ASY 7 assigned to usb-1-1 (Globetrotter HSUPA Modem)
08:23:32, 08 Feb 2016,USB-1 device 2 connected: Globetrotter HSUPA Modem
08:23:30, 08 Feb 2016,USB-1 device 2 disconnected: Has devices attached
Then this was resulting in the connection dropping, have since learn this is not the case.
Thank you for your help,
regards,
Dale.