The 1903 update for windows has been problematic for some users. Below is a list of links that provide details about the update. If your computer or you, suffer from side affects of this update, the Help Center may be able to help you.
Here is an item I found today, August 25, 2019. It mentions blue tooth and SFC problems.
This set of links was derived from a google search for “1903 feature update”. We try to include items that identify the date and time of publication. If you see an item that does not include “who and when”, be suspicious.