On my FTB singleplayer world, i have been getting frequent lag spikes/freezes basically every 5 seconds, sometimes a little more than 5 seconds. I checked my log and it says at net.minecraft.server.Minecraftserver.func_71267_a(MinecraftServer.java:360). It won't let me paste my log into pastebin.com; it won't open it. But that was one of the things that came up in my log. I am guessing that there is a problem with loading my chunks but this happened yesterday for the first time. Can someone tell me how to solve this problem?