Just received (less than one month) a brand new computer XPS 13 9310 2-in-1. Bios version 1.1.1, Windows 10 Pro

For every single pause (simple coffee break) lasting more than 10 minutes, the Dell SupportAssist On-board Diagnostics automatically started, close all my open windows, shut down all my work (Word, Excel etc) without even save the latest version of the ongoing works, scan my computer and display the result screen with the message "Success Hardware scan complete with no issues" CONTINUE button in blue color.

When i click on CONTINUE, the laptop reboot and i have to reopen all previously opened windows, all works lost !

I have open a ticket at Dell suport since 10 days almost, they have tried, no solution. 

I have uninstall all Dell support assist from windows 10 Pro, and i have the feeling this diagnostics tool is running from BIOS.

The crazy thing about this is that the scan run as much as i make pause a day. When outside, the screen remain on, high light (consuming electricity) etc.

How to get rid of this (simply disabling and preferably removing/uninstalling this tool) ? 

Thanks for your replies