...and now my Arduino Yun is not reachable anymore in the network.
I did reset to factory settings (holding down the WIFI-Reset-Button for 30 secondes) and did also reboot my router but nothing helps.
How can I bring him back to life ?
Edit 04.02.16
Replacing the "YunOverlayOnSD.ino" by the "blink.ino"-Sketch on the Arduino did bring back his heartbeat.