Why did some apps just vanish from my phone?

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Android Central Question

I am using a phone Samsung SM-J320F (Samsung Galaxy J3) with Android 5.1.1. I have, of course, some apps installed in that phone, and at the time of the incident about 1GB space free in the internal memory.

At some day it happens that when I used the phone again that some apps have been deinstalled. Really deinstalled, not just the icon on the home screen missing! Also I had to log in again in most other apps (like AirBnB, email client etc. ) as if I had those apps installed freshly!

What could have caused that some apps just vanish/get deinstalled? Has this happen before? If so why? And what can I do to prevent that failure in the future?