You fix it by allowing cookies to remain on your hard drive. After you log into Cox, a cookie will inform Cox during your next login you actually live in Rocky Hill.
Without saving cookies, Cox assumes you live at the first IP node...or last node depending how you view the route...in Wallingford.
For example, when I go to a Cox website, I get the following message: Hello we do not offer service in Merrifield, VA. However, I subscribe to Cox service and Merrifield, VA is 20 miles from me. Cox just assumes I live near an IP node in Merrifield, VA.
You could also try to correct the Zip code on whatever streaming site you're using.