Unlit Transparent Shader breaks down

Hello,

I've encountered a strange problem and I don't know what is causing it and how to fix it. If I minimize the application at the start and enter in it again I receive a pink screen because the material I'm using has the Unlit Transparent Shader and for some reason the shader breaks down. It doesn't happen all the time, and most of the time when it happens i need to minimize the application and enter in it again multiple times. This happens on Android 7.0 and my Unity version is 5.6.1f1.

Any help will be most grateful.