@Maurizio-Messa Here is grasping at straws, but..... The time or three I've seen a failure to sync I was able to fix the problem by reflashing the device. See https://docs.onion.io/omega2-docs/factory-reset.html. Ought to take just a few minutes.
Again, grasping at straws. If that doesn't help I'll take a more detailed look at it.