unrealed 3 Static Mesh shadow problems?

Hello, this is probly a noob question, but I’m tryin to build modular statis meshes so i can snap a level together but I keep getting these horrible shadow tiling goin on.
Somebody please help!

A couple of vids see below, honestly if you are learning then youtube search has to be your friend cause you’ll get very little help from those with knowledge from the forums (those that are left in UDK will probably lean towards using their time in helping those with established games).

As I posted just a few moments ago on another thread, why learn a legacy engine when you have a new one with an active community to support …?