Minecraft Crash due to entitiy processing

I cant screen shot this and its a big contraption and hard to explain, however.

The contraption is a compact 32 piston extender/retractor circuit. It makes use of items circulating round 120 hoppers the output of the hoppers via comparator incrementally extends the pistons in initially one at a time and as it extends it will work on multipple groups of 12 increasing parrallelism as it goes.

If I get within entity processing distance about 80 blocks away. The whole game freezes and then crashes to the dashboard.

I would love to share this world for you or come build the device for you as it takes a maybe and hour or two to construct.

I wish I could give more information on this, but I just cant go near the device in my world anymore. It was always laggy and didn't work on this version of the game. But now it's a game breaker.

PS this worked perfectly on xbox one edition. There are videos of it operating on the Minecraft Redstone club on XBL, where I am an Admin.