The symptoms you described could occur if you had an intermittent signal issue during recording. Contact Cox and schedule a tech visit to check your signal strength. If an issue is found on Cox's side of the demarc (box on the side of your house), you won't be charged for a service call. If the issue is on your side, you'll be charged a service fee for the visit unless you have Cox Complete Care ($10.month). You can subscribe to CCC before you schedule the tech and cancel after 90 days. if you cancel before then, you'll be charged for any fees that were waived.
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