May be there is a problem with the new update KB4340917
The Microsoft web page says
If you installed earlier updates, only the new fixes in this package will be downloaded and installed on your device
Web page July 24, 2018—KB4340917 (OS Build 17134.191) - Microsoft Support
This implies that if you have not installed earlier updates, it would apply them.
What we know
10th July Windows Update KB4338819
This caused the issue July 10, 2018—KB4338819 (OS Build 17134.165) - Microsoft Support
16th July Windows Update KB4345421
This applied on top fixed the issue July 16, 2018—KB4345421 (OS Build 17134.167) - Microsoft Support
24th July Windows Update KB4340917
This is an unknown quantity at this stage July 24, 2018—KB4340917 (OS Build 17134.191) - Microsoft Support
You could try removing the 24th July update and applying the 16th July
May need some extra reboots
