Minecraft crashes ever 45 seconds or so, regardless of what is happening. it has crashed while fishing, running around, chopping trees, using chests/furnaces and even while standing still. it seems completely random.

however, when i first started playing 14w31a, it would run for hours and never crash. then today, it started crashing every 45 seconds (not an exaggeration) nothing changed. i didnt update or change any settings, i have no mods installed or running. i am completely confused.

im sure this is a bug with the new snapshot.

also, the only lead i have is from the crash report. every time it says
" Description: Exception in server tick loop

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
at java.util.HashMap$KeyIterator.next(Unknown Source)
at qi.a(SourceFile:163)
at net.minecraft.server.MinecraftServer.y(SourceFile:614)
at net.minecraft.server.MinecraftServer.x(SourceFile:530)
at cxc.x(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:446)
at java.lang.Thread.run(Unknown Source) "