up to 25% packet loss between 11pm-8am
It usually starts dropping packets late in the evening and the problem persists until morning. 300/10 service, download doesn't seem to be affected, only packets sent out. Cable modem signal is pretty hot here and increases as the temperature drops or sun goes down, some channels can see as much as +15db, running a -9db attenuator on it now to keep the levels closer to optimal but this doesn't seem to have any affect on packet loss during the hours specified. Router/modem is fairly new, purchased within the last year I believe, Arris SB8200.
The upload almost never reaches 10Mbps , usually around 5-7.5Mbps depending on the time of day but I rarely see it dropping packets during daylight hours, only at night. I can run back to back tests during the hours it starts dropping packets and see upwards of 25% at the worst.