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Xfinity using WiFi signals in your house to detect motion
(www.xfinity.com)
This is a most excellent place for technology news and articles.
At least in my case, my DOC IS 3.0 modem was having connectivity issues. My neighbor in another apartment had similar issues: dropped connections, slower than expected speeds, etc. Switching to DOCSIS 3.0 modems solved the problem. I guess Comcast upgraded their hardware and it wasn't compatible with my modem anymore