Purchased new SB8200 in February and installed and activated it per Comcast and Arris instructions. Had new Linksys MR9600 router already installed and operating. Had no trouble for a few weeks and for 3 months now recurring crashes and DOCSIS 3.1 dropped to DOCSIS 3.0. However, the DOCSIS chipset remains online to Comcast and they show the modem and system still up and operating with no indication or record of outages from their viewpoint. Had 5 Comcast technician onsite inspections and nobody has the answer. Currently have a borrowed Comcast Xfinity modem in place and absolutely no outages, slow downs, or connection issues which is at least circumstantial evidence that the Arris SB8200 modem is faulty. Rebooting resumes internet connection and service but only briefly before another crash. I do not know whether SB8200 is incorrectly configured but I changed nothing after taking it out of the box and would not know how anyway. If there is a solution I would be interested in being pointed in the right direction.
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