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Thanks Dave & Chuck. We have have no problem using the computer, and the printer's good too, now that I leave it switched on all the time.
It's a wireless wildlife camera we have set up in a hedgehog box in the garden that's the problem. The picture keeps rolling and the camera supplier has suggested we try changing the channel, he says it could be picking up interference from other wi fi connections.
OH has suggested we leave well alone as he's worried that we'll end up regretting it. Neither of us are all that clued up on technology. :o(
The supplier has sent instructions on how to change the channel and it doesn't read particularly easy to do but I am tempted to give it a go.