Intermittent Connectivity - Disconnecting several times a day

I have been dealing with my internet connection dropping many many times per day for over a year. I have had a couple of Comcast techs out to my house, received a new router, new modem, purchased Xfinity Pods, upgraded my internet plan, move the router to different locations in my house and I use the Xfinity XFi app to help monitor our connections. I have the same issue with three different PC laptops. My family does not experience the drop in connectivity while using their Apple products (Macs, iPads, iPhones, etc.).  I would love some help in resolving this issue. I work from home full-time and it's difficult to work when I lose connection during every WebEx and multiple times an hour.