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UI buttoms don´t work

Hello,
I´m having some issues with the buttoms of the UI widgets. My problem is that if the game on android goes to a background or the phone go to black screen then if you come back to the game the buttoms don´t respond, it seems like they had been rescale and I can touch some of them. I don´t know if I´m not setting up something properly. Does anybody have this problem?.