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I have the same Problem and followed your proposal, but without any success.
I have already done the following:
Downgrade from Windows 10 to Windows 8 by complete new Installation!
Installation of all new Drivers
Installation of new realthek Audio Driver
System check of my new Installation on Dell XPS LX 502 with Dell System check - everything okay
Installation of new Cross DJ pro Software
Installation of U-Mix Control Pro
Check of all your recommendations below - please also see the screenshots
If there is any running program in the background now please give me your advice how I should be able to find it out. I´m now totally frustrated and tired.
Nevertheless I´m interested in any solution to fix the Problem (beside throwing my Notebook out of the window and buying a new one

)
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