If your internet connection keeps disconnecting, the problem could be a high upstream power level. If your upstream power level is at 58 dBmV or higher, an Active Return amplifier could be the answer to your problem. I finally gave up on COX technical support and technician house visits and took matters into my own hands. Now, regardless of what happens "at the street", my connection remains steady and consistent.
Materials used: Motorola BDA-K1-RA Active Return Amplifier.
UPDATE 8/7/2016: I now recommend the PCT 1-Port Variable Gain Signal Amplifier With Active Return by PCT - https://www.amazon.com/dp/B0012HQL44 . It runs much cooler, allows for upstream and downstream signal level adjustments and costs about half the price.
Recommended HSI website: http://www.dslreports.com/
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Resolve Cable Modem Disconnects Caused by High Upstream Power Level | BBStudioProductions
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