After rigourus testing I have concluded that there must be a bug relating the wireless card 1820A in the DELL XPS 13 9350.
Steps to repoduce, install VirtualBox, spin up VM, close lid, 1/3 times the network card does not recover from power save mode and cause Windows to bluescreen. If the computer has entered hibernation, the current session crashes silently and you will be greeted with the DELL logo and a new Windows session where your previous work is gone.
Would appriciate if DELL official devs could look into this.
All I want is a functioning laptop, if Dell is interested in fixing it. Please contact me.