@all In fact, I have opened a support case to TP-link support; I have received yesterday the answer: "thanks to report this issue; we are working on this issue; the time synchronizzation will be up...

@Rallyz and others Same here in France. I don't remember it was a problem previously (although I've had these three HS100s for a few years); after the firmware update (now 1.2.6, hardware version...