I had the exact same problem too with 2 different CIsco DPC 3825 modems. The Cisco DPC 3825 was working great for 2 years without this problem, and then this latency problem occured which stayed the same after getting the cgn-3 modem. I remember doing the same tests for a different reason back then and I would get 1 and 2 ms constantly to my router, 13-14 ms to rogers.com, and 23-24ms to google.com. Of course there was jumps every odd time but it was mostly around those values.
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