Checking for latest version at every "All files" screen

### Actual behavior
When I go to the root "all files" screen, the app checks if the last version is installed. I have a small lag (sometimes a fast blackscreen), and I have the message about version "No new version" or "New version available".
If I use NC app and my smartphone became locked, I unlock and the screen of NC have the same behavior (lag + message at bottom)

### Expected behaviour
No lag, why not just notification in the notification bar of android ?
A check when I am in "expert mode" only ? A check when I am in settings only ? A check per day ?

### Steps to reproduce
1. Go to the "home" page "All files"

### Environment data
Android version:
7.1.2

Device model:
Nexus 4

Stock or customized system:
Lineageos 14.1

Nextcloud app version:
20180118

Nextcloud server version:
12.0.4