It already happened twice to me, that my internet provider just cut off internet connection out of sudden.
I called them and I was told, some general conservation of cable network is being done and losing internet connection can unfortunately repeat, until it's finished.
So once again, sorry for such "unpolite behaviour" (previous and eventually in the nearest future) - I hope everything wll be fine soon!

P.S. Of course the same applies to Isengrim (Ialath).