I have 1gig service with an Arris SB8200 modem that has dual ports and LAG (link aggregation) enabled. Usually, I get 600mbps but every night (after midnight) the speed degrades to ~6mbps. The speed will remain slow until I disable and then enable one of the 2 bonded ports on my router. Once I disable the port the speed goes back to 600mbps and remains there until the next day.
The modem event log doesn't have any errors just a status log every day like this:
"CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1;"
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