to shut down shut down internal server

[hlg360]

hi I have a problem of playing on 1.7.10 with mods and like I'm playing and out of nowhere and as if I had no internet the chunks stop loading the mobs stop walking I don't take damage anymore the blocks don't drop when I break them and I already tried to play without internet to see if it stopped but the same thing happened I was playing and all of a sudden it starts again and when I click to exit it appears to close the internal server and minecraft stops responding and there is no use waiting he doesn't respond again someone please help me