Canvas/UI dissapears shortly on inputfield tap - android

Having a hard time fixing this problem on my android device. (Samsung Galaxy s4)

When I tap an inputfield to show a popup keyboard, my UI dissapears, until I tap the screen again. Sometimes it seems to happen randomly for only a blink and then the UI returns. But happens everytime I tap a inputfield.

I also noticed, it never happens when all inputfield objects are disabled.

I`m using a canvas with screenspace - camera rendermode.

I didn`t get to test it on any other device except for pc, where everything works perfectly.