A few days, Comast tech came out to my house after I experience no wifi for an entire week. Comcast tech installed their new Xfinity voice and data modem; my Windows 10 PC with 16 GB and 2 TB drive has been acting weird. It occasationally freezes or run extremly slow. I checked and rechecked for virus and the searches come back clean. My computer was NOT acting like this before. I suspect its the new Comcast Xfinity voice and data modem.
I am so glad to read that someone else has experienced Comcast new voice and data modem is causing their PC to run slow or freeze. My PC started freezing and running slow after Comcast came replaced their old voice and data modem with a new one. My PC similiar to yours is a Windows 8.1 with a 1TB and 16 GB of ram. Before the switch, my Windows 8.1 PC was running smoothly.
I was glad that I came across your post because it confirmed what I suspected all along. It is Comcast new Voice and Data modem that is causing freezing and run slowly issues with my PC.