I have had my kindle since Christmas with no problems at all. A few days ago it wasn't picking up a connection to my router. I managed to sort it out but then last night it went down again and I just can't get it back gggrrrr!! All other devices are connecting fine.
nina have you tried changing the channel that the router is using? I had trouble like this when running more than two things on the wifi and found out that I was using the same channel as my neighbour and we were cancelling each other out. I googled the problem and found a programme which scanned nearby frequencies and then logged into my router and changed to one that was not being used.