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You may very well get better performance with a modern high quality stand-alone router. And if you want to continue to use their phone service, I recommend that you use this stand-alone cable modem (with phone support) rather than buying an 862 which has only 8 downstream channels compared to the 16 channels of the CM500V.
The 862 is a combo gateway device that would need to be put in to bridge mode if you want to use a separate router with it. And it is known to be problematic
Look through their approved devices here;