My iPhone Builds with Unity 5.1 and up on iPhone 4 and 5c are having issues

The issue is this, my Unity 5.0 project use to work somewhat ok on iPhone 4 and 5c, but I updated to Unity 5.1 and now I have issues. On those iPhones when I switch from the menu scene to my main scene the previous scene's background is still visible, there are other graphic errors, and buttons no longer function correct. It is as if the two scenes have merged and locked up the game.

On iPhone 5s and up there have been few issues no matter what version of Unity I use. Has anyone else had similar issues or knows what could be causing this for the newer versions of Unity5?

Currently I installed the older version of Unity and have been building the project with that.