PROBLEMS WHEN I RUN THE APP

I am done making the app. It´s like a game and you have to pass screens. Firstly, I installed on Android 4.2 and in the second screen the app stop running. So I try in Android 5 and the app is working but instead of going to the next screen each time when you press the button, once in a while (normally after 2 screens) is coming back and you have to repeat the same process. 

What can I do for correct this?

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see here how to switch screens correctly
The recommended method of switching screens in App Inventor

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Thanks so much. The problem is how to change the screen. 

I read the tutorial but I don´t have a manage screen so I don´t know how to fix it. 

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Are you using Clock component to inspect data and switch screen? If so, maybe that's the issue.

Also, it would help if you post screenshot of your blocks.

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Thanks so much. 

I have 20 screens like these one and I know I should use close blocks but I don´t know how.

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use Screen1 as manager screen

in the button4 event use the close screen with value block together with a text block "calendario"

see again
The recommended method of switching screens in App Inventor

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I have 20 screens like these one 

then you should also read this Building apps with many screens

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I am not using any clock 

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Thanks so much for all your help. I will try to fix it :)

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