RE: Dell XPS 15 9550 Blue Screen
Run the System file checker. It scan for any corrupted system files that could be causing problems and fix those corrupt files as well.
a) Press Windows key + X key at the same time, select Command prompt (Admin)
b) In the command prompt type the following command: sfc/scannow and press enter
If no corrupted system files were found , then I would suggest you try the following steps:
a) Select Command prompt (Admin)
b) In command prompt, type the following commands and press Enter after each command....
DISM.exe /Online /Cleanup-image /Scanhealth
DISM.exe /Online /Cleanup-image /Restorehealth