When this happens, the internet on my laptop (obviously) goes out too, but it then doesn't reconnect when the modem comes back on.
My modem often fritzes out (IDK if it's the modem itself, the ISP, or what, but yeah), whereby it kinda just restarts. Reason 1, something that isn't Win 10's fault: I have an unreliable internet connection due to 2 reasons on my Win 10 laptop, which is connected wirelessly to my router, which is connected by wire to my modem.