I've had the Lumia 920 for about a month now, and everything seems to be working fine except for the Wifi which keeps cutting out when I turn the screen back on. I have ticked the box which says to keep Wifi connected when the screen times out, but this doesn't seem to have an effect. It seems to be slightly hit and miss as to when this happens, but it seems to occur roughly 7 or 8 times out of 10. The only way to solve the problem it seems is to toggle the Wifi off and then back on again, which isn't a huge problem but is just annoying to have to do so often. Does anyone know of a fix for this, or of what might be causing the problem?