Repro steps:
1) Open the project I attached
2) Build and run scene.unity in it on iOS 8 device
3) In the build press the button in the middle
4) Rotate device by 180 degrees
5) Repeat steps 3 and 4 until you notice the particles freeze
6) Notice the button still works and makes the screen white

Expected: screen is rendered all the time

Reproduced in: 5.4.0b18; 5.3.4p6
Xcode errors in 5.2.4f1

Works on Metal
Reproduced with OpenGLES2 and OpenGLES3