Since the nether update, when I play on realms, it crashes within 2 minutes.

I use pocket edition, and since the nether update, I haven't been able to use realms or join other worlds without it crashing within minutes. Nothing helps. I can access my own worlds, but I can't access the realm I play in all the time. It's really made my Minecraft experience go downhill, and I need this fixed as soon as possible. It has been months with no fix.