Simliar issue with LAG enabled on the SB8200 and my router. Appears this is an old issue and Arris has updated the firmware to address the problem. However, that firmware is not being pushed to customer owned Xfinty modems. I have to disable LAG on the modem to keep a stable connection, eliminate modem self-reboots and have my router log fill with eth1 "buggy" errors (eth1 is the second ethernet port I am using for LAG on the router).
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