Surface Pro 4

System Update just released..

Installed system update, later opened page which locked solid, could not turn off without either disconnecting battery, or closing lid.
Closed lid which shut down computer, opened lid and tried clicking start, no luck so did the usual emergency escape procedure by pressing both sound and start buttons together....eventually a note appeared on screen that an update was available which downloaded.
After which all appeared ok.....Non of the above system updates appear in Windows updates, I suspect it was the pen driver which caused the problem.