Always when you are coming back from the nether the game crashes, and the terrain don't load

When we go to the nether (this is a world problem, not only mine, i mean, even if you play on phone or pc, this problem will happen to you if you are playing on my map/world) the nether loads, but when you are going back, the game stops at the loading screen, it doesn't load, so when that happens the player have to close Minecraft and open it again, and that happens always, then sometimes your are playing and suddenly you get in fire and loose life.