[Question] Event Trigger Pointer Enter

Hello, I'm developing a game in Unity and a couple of days ago I updated my Unity version from 5.0 to 5.3.0f4. I got two buttons on my 2D game to make the character go forward and go back, respectively. In Unity 5.0, when I built my game for android, the behavior was as expected:

• Pressing forward the character went forward. If I lifted my finger or didn't touch the button anymore, the character stopped immediately.
  
  
• Pressing the back button the character went back. Same...

[Question] Event Trigger Pointer Enter