Sometimes when I reboot my LG G3 (about every other time I do that) some apps show up in the main screen with the default Android icon and the app name underneath, but when I tap to open the app it says "Application not instaled". When I look for the app in the app list it does not show up there.
This problem usually happens to Google Sheets, Google Slides, Google Translate, Google Photos or Google Maps. Less comonly also happens to other apps too, but the mentioned ones are responsible by the vast majority of the "app abduction" phenomena. It does not happen necessarily with all of them at same time, sometimes one or two, sometimes 6 or 7, being the mentioned ones the usual victims.
I saw some people who reported this problem in other LG devices when the apps are moved to the SD card, but I don't use any SD card on my phone.
I'm afraid that my SSD is dying. The problem with other people pointed to Android having difficulty to read the app from the external SD card. Since in my case the apps are installed in the SSD, so it may be failing intermittently. The phone sometimes freezes and reboots itself from time to time too.