Hardware Back Button Issue

Hey I also encountered this type of problem in one of my pages in my current project. Then I concluded that in android device the data got from api is such bulk to handle by the app. It was physically overloaded. The weird thing is it works fine in dev server. But in android device it shows only white screen at start up. After tapping, it enter into the expected format. If this is the case, probably your page is physically overloaded.
Try any api request with some delay in you startup (if you have).

ionViewDidEnter(){
this.platform.ready.then(()=>{
setTImeout(()=>{
//api request  or closeoverlayservice backbutton subscription
},500);
});
}