It's what the apple care guy thought..... The wifi bit ( top right) is grey and alternates between looking for wifi to wifi on. This isn't the first time this has happened.... Last time AppleCare talked through a load of stuff and seemed ok. Hadn't used pc for three days... When it came out of sleep mode it couldn't connect to the internet.... Wifi router is fine as its fine on a windows pc and this iPad and iPhone.
An thoughts would be appreciated