Unable to join friends realm, loading forever!

My friend invited me to a realm the other week and I played on it several times with no problem, but all of a sudden I'm unable to join. I will get to the loading screen but that will just show forever. I've tried restarting my Xbox, restarting Minecraft, I even uninstalled and re-installed. Nothing works. I've made sure my Xbox is connected to my internet, but I don't think that's the problem.