Over the last week or so, the wifi in our house has gone really slow and I have no idea why, the router is in the spare room, it works fine in that room but as soon as you walk out of that room you lose connection, go back in, it reconnects again. We aren't doing anything differently, tried resetting the router etc but no joy. Strange thing is it always seems worse at night. Anyone got any ideas before I spend hours on the phone to sky and BT please?

Cheers, karl