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.
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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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