I have a Philips SNU5600 WiFi dongle plugged into two machines (ie I have two SNU5600 dongles, one in each machine). One machine is running 10.10 and the other is running Linux Mint.

The dongles work absolutely fine, except if I do a lot of file transfers to a NAS attached to the wireless router. After a while the connection to the router will go.

To get the connection back I either need to run sudo /etc/init.d/networking restart or I need to unplug and plug in again the dongle.

Otherwise the dongle works fine (web browsing, streaming, etc).

Output of lsusb:

Bus 002 Device 003: ID 0471:1236 Philips (or NXP) SNU5600 802.11bg

Output of lsusb -v at http://pastebin.com/dXYKkF01

What steps should I take next to resolve this? Is it a known problem?

Could it be the router? It is a 3Com "OfficeConnect Wireless 11g Cable/DSL Gateway Version 1.02.15".