Ethernet disconnection

Running fully updated OSMC on my Raspberry PI 2 , I get random ethernet disconnection . Switchig off/ on the modem and/ or rasp, may cure the problem, but only temporarily, as it repeats itself. My cat6 and rj45 are ok, and the modem wifi runns smoothly. I have changed my modem, but the problem persists.

This is also happening on my other machines, running Android 4.4 and 5, except on windows10

Whose to blame?

Not an OSMC issue if it occurs to all your devices.

you are right.
The problem was a lazy ethernet socket connection.