As you can see, my computer is working OK, but the past 3 days at about this time, our two Kindles have stopped working. The message says they have gone offline. Whats that all about? It comes back on again after a couple of hours.
I'd guess that they are having issues connecting to your modem.
Do you cycle the power of the Kindles to get them to connect again ?
If it happens again it might be worthwhile restarting the modem.