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Really bad I paid for upgrade package that can barely handle one tv
Your TV service depends on Internet? Do suspect problems at the modem or over WiFi? Describe your equipment.
If you're in a promotional deal with Cox, you may be stuck with this service until it expires.
+1 for what model modem and router do you have? If you have a stand alone modem, post your signal levels from 192.168.100.1.