My Comcast usage went from an average of 100GB/month to 1020GB last month and I nearly hit the cap.
Spoke to someone @ Comcast Tier 1, then got thru to Tier 2. Basically she said they never have problems with the bandwidth counter, and it was likely malware in my home network. I ran "Norton Power Eraser" and "Malware Bytes" on both Windows PCs at my home network, changed wireless passwords, rebooted my Tivo. Problem has gone away. I would suggest running these two (free) tools on your computer before blaming the router.
I have a Arris Surfboard SBG6782-AC
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