1. It could be tha the ISP is doing maintenace or having problems
It's very unlikely to be us TBH. None of the maintenance we conduct across our systems is ever likely to interfere with the connection between a customer's network card and router.
It could be interference from other wireless devices. Other electrical objects have also been known to cause interference. Are there any patterns as to when it happens? Does it always happen in the evenings for example?
You're network card/router will probably allow you to specify a
channel to connect on. In the UK you should be alright using either 1, 6 or 11. You might want to try each of the two channels that are not in use to see if you see any uplift in performance.
Kind Regards,
Bob Pullen
PlusNet
http://www.plus.net