Hub Resetting only when Laptop connected

Hi,
I would be grateful for any pointers or advice on how to solve or track down the following problem.
I have a BT Business Hub which is connected by cable to a desktop PC and by wireless to two laptops.
( The laptops are only very occasionally used at the same time as the desktop, which is my main machine
and is used virtually all day)
Up until recently all three computers could be connected to the Internet without any issues, but
recently when one of the laptops is in use ( and it's always the same laptop ), my business Hub
resets itself and the connection is lost before being re-establised.
Odd as it sounds, this only happens occasionally, but as far as I can work out, only when the
troublesome laptop ( which is otherwise operating fine) is in use and connected to the Internet.
I could be going off on the wrong track, but would the laptop in question be capable of sending data
to the hub which would cause the hub to reset? And if so, what can I do to detect the problem?
Apologies for the vagueness of this query, as I am slightly confused as to what might be going on.
Thanks
DL

See if anything here helps, especially the speed or encryption settings.
Wireless Help
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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