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If you call technical support, they generally keep a log of your cable modem status, such as downstream power (signal it's receiving), upstream power (how hard it's working), and upstream and downstream snr (signal to noise ratio).
They can look at this chart and tell you if your modem has always had bad signal or if it's something recent.
If they tell you that the line has too much noise on it, this usually means that the shielding has been damaged on a cable somewhere, or you have a really nasty connection somewhere.
If your modem drops in and out even though all your signal levels are good, then it's most likely a loose connection somewhere or a plant (outside of your house) problem.
Please note that if your cable light never goes out but you lose connectivity, it's most likely something down at the cable company, but CAN be a bad modem, or something wrong with your computer. This is not an RF (signal) issue.
If the cable light DOES go out, then it's an RF issue and you need to start looking at the other troubleshooting sections.
Should have inside wiring checked for ingress also. Unshielded TV sets, VCR's, Cable boxes, splitters (Radio Shack), connectors (crimped) and coax cable (damaged or store bought) can cause ingress. Most internet provider's technician has the ability to test for it. Remember, inside wiring is the property owner's responsibly, especially if you performed a self install. Coax cable should at least Quad shielded. You can Google ingress and egress. If ingress is detected you will get slow speeds or connectivity drop offs. If you have connectivity you can check transmit levels, receive levels and signal to noise levels by going to 192.168.100.1