After flattening an area with TNT, and leveling it with bedrock (in creative mode) simple redstone circuits work intermittently in that area of map.

Basically, in an approximate 100x100 tile area, I can create identical circuits and some of them will not work. The circuit is a lever, 2 redstone dust and a piston in a straight line. Not to mention several crashes that shut down the app. These crashes happen every 5 minutes or so. I am using the newest version of the game (1.6 released end of August 2018)