I know I am a considerable distance from your area in California but we are experiencing the same issues here in Southern Oregon. This has been going on for well over 3-4 months for us. My speeds are amazing up until around 6 PM then they drop to almost unusable speeds until almost midnight. I have notified Charter and they check my connections to the modem and say all is well. My signal and power levels are well within the norm for the modem too. It seems like this is a growing issue all along the west coast. It really sucks because when I want to use my internet connection to stream movies at night it is basically crippled. I hope they find some resolution to this problem very soon. As others have mentioned at the very least DSL is more stable. I will take stability over speed any day.
Here is a snapshot of my speeds as of 5:00 PM Pacific time.
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speedtest.ookla.com/resu ··· 4211.png