disappearing app icon after install

So I have installed Asus ZenTalk app.
It will sit at home page and app drawer. after awhile, the icon of this app will disappear from phone. When I try searching it, it returns with no results. But when I search it in the play store, instead of install button, I get open, meaning it is still on my phone, just cannot access it from home screen or app drawer.
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Go into settings and find support. You should be able to access it from there
how long did it take for the icons to disappear?