I ran in so much problems that I preferred to install the system for the third time..
I your first answer Guglielmetti, you asked me whether I installed via install or knxinstaller..The first 2 times I installed with install.
And now, I tried knxinstaller..
All seems alright for now..but it is because I've not rebooted a couples of times yet..nor I have installed third-party applications..I just have the system with the apps installed by default..
Do you think the problem could come from the "install"? or because of other installed apps?

Thank you.

Julien.