My Dell XPS 8700 2014 is driving me nut

Since I upgraded to W10, the Audio Service and internet connection both keep crashing. Randomly.

My computer is the only one hard-wired to the router. We have others and none loses their signal. I made sure to try wi-fi on and off, no difference. Tried a different cable.

The Audio service crashing is much more annoying. It happens every 15 minutes. Everytime, I can restart the service like if nothing happened.

I tried to update drivers, disable / uninstall every listing in the Audio controllers (device manager). I have NVIDIA, Realtek and Logitec Webcam 500 High Definition Audio.

Audio service keeps crashing, no matter what.

So far the culprit is *tadam*; Microsoft Security Center.

Now disabled and back with Avast.