I have same thing happening with SB8200, like every week or month it would drop down to 30mbps and power cycling the modem is the only way to fix it, I am in Phoenix.
Intermittent internet connection on SB8200
In this case could you please help us with your current speed plan and also we need to check for the modem cable signal level to isolate the issue.
http://arris.force.com/consumers/articles/General_FAQs/SB8200-Cable-Signal-Levels
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