Buttons not always working on new android phones(taking multiple clicks to work)

Hello,

I have a problem with some of the newer android phones.

The buttons are not always working, they take multiple clicks to work. It is happening on phones such as S7 & note5 And I dont have any phones like that so I can't test for myself , I found out about this problem after publishing my game.

But I think I know why this happening, my buttons have 2 components. 1- the default OnClick() button component and is EMPTY. 2- a trigger event , on pointer down component.

The reason I'm using an empty OnClick() button is to highlight the image of the button when the user presses it. And I want the function to work immediately after being pressed down and not on release hence the trigger event , on pointer down.

Could this be the problem? Could these two be interfering with each other? Or is it because of the phone's sensitive screens? or the drag thresh hold in the event system? which is of default value of 5. should Increase the value?

Note*** The buttons are working perfectly on Iphone, Wps and various androids (some old, some new) I have a J5 and a galaxy nexus.

Please help! And thank you for your time and support!