Microsoft teams stuck on "Loading Microsoft Teams"

Hi,

I have a reccurent issue with MS teams app from desktop on Windows 10, it loads, and ask to sign into O365. Then it hangs for hours.... task manager shows 4 Teams.exe threads. 

I have uninstalled, rebooted, and reinstalled 64 bit Teams.  Cleared all cached credentials in Windows 'credential manager'

Cleaned up user Team cache with

set TEAMPATH=%appdata%\Microsoft\teams

del /Q %TEAMPATH%"application cache"\cache\*.*

del /Q %TEAMPATH%\blob_storage\*.*

del /Q %TEAMPATH%\Cache\*.*

del /Q %TEAMPATH%\databases\*.*

del /Q %TEAMPATH%\GPUcache\*.*

del /Q %TEAMPATH%\IndexedDB\*.*

del /Q %TEAMPATH%"Local Storage"\*.*

del /Q %TEAMPATH%\tmp\*.*

pause

Reinstalled Teams : It worked once but hanged again after relaunching Teams.

Here is the window Teams gets stucked on :

I can use Teams Web app but have the message :

We're experiencing limitations with OneNote in Microsoft Teams. Please use OneNote for the web to edit this notebook.

When opening OneNote for the web i have issues with notebooks not showing some tabs with folowing error message :

Reloading page does not solve the problem.

Who can you help me for both problems ?