Hi. Many thanks for replying.

The device is totally stable when connected through ethernet. It used to be just heavy data transfer that caused it to stop functioning wirelessly - now it happens regularly, regardless of traffic. No ther devices succesfully use the router (I do have up to 3 other pc's working wirelessly at any one time, but it is problematic).

How do I change the wireless channel, and what is a UPNP service?