Hi Daniel,
Good day! I am Independent Advisor Louie S.. and a Microsoft/Windows user just like you. I am glad to be able to provide assistance for you today.
Your issue is quiet unusual, try to uninstall or reinstall iTunes and Spotify and see if the problem still persists.
Sincerely,
Louie S.
Hi Louie,
Sorry for taking such a long time to reply. I finally found out my incredibly stupid error to this problem. As I stated, I would get a grinding noise and a female voice stating "Siri is now connect" just as the PC was powering down. I have an USB Bus behind the PC so that I can have up to 6 USB devices connected / charging at the same time. One of the devices was a cordless USB horseshoe shaped headphones I use for listening to music that would activate as the power would be shut off from the PC and connect and play the voice through the PC speakers! Didn't even know I had Siri in the headphones until I received my Apple Earbuds last week. A light came on and I disconnected and turned off the horseshoe shaped headphones and no longer have the grinding and Siri voice! Thanks for your advice. Worried my hard drive was on the verge of crashing.