I'm in Northern RI, and lately my Cox HSI has been slowing to a crawl during prime-time hours, especially on weekends. Slowdown starts to occur around 7-11 PM EST, and usually goes back to full speed a little after midnight.
It's their preferred 25/5 plan, but prime-time on a Friday night, I can only manage around 8-12 mbit/s, and maybe 10-15 during a week day.
It's especially noticeable with Steam, where a download will slow down to around 800 KB/s - 1MB/s. During this period general Internet use will slow as well. If I run a speedtest with Steam going, I'll be lucky to get 500 kbit/s on it - so the connection is being saturated.
I've verified this with multiple computers, as well as connecting directly to the modem via ethernet.
Modem is a Motorola SB5101 connected to a Linksys WRT150N with DD-WRT. Power-levels during the slowdown are:
DL : 10.4 dBmV, 37.2dB SNR
UL : 43.7 dBmV
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