The thing is, most of the time the wireless signal is excellent, and there is no problem getting on the internet through the laptop or the desktop. But ever now and again, while the desktop is fine, the laptop just can't pick up any signal.

The last few nights, taking my cue from Simon G's post ("switch the router off regularly, perhaps once a day, before its memory is exhausted"), I've been making a point of unplugging the router last thing, and reconnecting it in the morning. So far the problem hasn't recurred since I've been doing that, though it's still early days. So I'm hoping it's the router getting tired and exhausted - and at some point I can maybe get a new and better one.

The trickiest problems, I always find, with any device, are the ones that come and go of their own accord. With a consistent fault you can at least set about eliminating possibilities.