Is one of the tuners going bad?

One out of every dozen recordings has a bit of sputtering, pixelation, hiccoughing — the kind of interference you might get in bad weather; more annoying than unwatchable. Just once has a program been unwatchable. Always different channels. No real pattern but it is happening more and more. One time there was a small red line running from top to bottom every 30 seconds like in the old days of VCR recordings with an old tape. Is this the beginning of end for hard drive (Genie) or a tuner or ???