Hi all, the problem is with UDP protocol and their servers. All worked perfectly fine in my pc but this game (including online games like PoE) and cause of this i was convinced that the problem wasn’t on my side (it is but ONLY with this game). After a bit of investigation i have managed to fix it. Update all of your drivers (specially the network card ones) and, above of all, check your router udp configuration. I had disconnects each 5 minutes and now all is working nice, including dungeons, arena, monoliths and teleports.
Good luck!