Crash after some minutes

Minecraft crash is completly random (If I don't move,if I hit someone,if I build), but in a 3 minute interval.

General FPS: 60 (+/-)
But is fluctuating very much/fast !

How the crash is working:
1) Enter the server, select mode, after 3 minutes, the crash is incoming
~ Sometimes before crash the players and mobs are stacked, no move, but I can move myself and after 5 seconds crash. (I don't think is about net, because crash, and on other games, my net is perfect, low ping)
2) If I leave it 1-2 minutes without close, is like it is recovering, but again the players/mobs are stacked !
3) I don't move the character, after recovering, I wait 10 seconds and tell me: java.io.IOException:An existing connection was forcibly closed by the remote host (I was kicked because I wasn't sending responding to the server right?)
4) Connect again, after kicked, to server, play 3 minutes, and again repeat step 1 !

Without forced crash, game output do not show any crash log, so I played 1 minute, then I forced crash the game for some logs !