Hello,
I've recently had to clean install Windows 10 onto my XPS 12 9Q23 convertible laptop. All is well apart from an issue with the rotation sensor. It seems to rotate the screen portrait without issue, but switching back to landscape is near impossible without disabling auto rotate and doing it manually with keyboard shortcuts. Never used to have issues with this prior to the clean install and I was running the same build of Windows 10. Also when flipping/folding the screen flat to use as a tablet, the laptop used to automatically enter tablet mode. It no longer does this either.
I am running the latest BIOS, latest Video, chipset, touchpad drivers. LCD firmware is up to date, and all latest Windows 10 updates are installed. Seems to be quite a well documented issue as I have noticed other posts from a few years ago with similar issues, but only resolutions offered for the 9Q33 rather than the 9Q23. 
Wondering if anyone managed to ever get a resolution to this for the 9Q23? Thanks
Tom.