First it was Virgin Media and now sky, I'm certain its the area I live in.
I'm with Virgin Media and I was having all sorts of problems. Turned out I had their 'SuperHub 1' and they sent me their latest 'SuperHub 3' and it did a world of good. I've got a CAT6 cable on standby for times with low signal too. I'm ages away from my router which is the problem but I got 30 metres of CAT6 off ebay for about 8 bullet.