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Digital Tuners can develop -Digital Glitches- that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.
Also can Call With A Phone the Tv Station and have a Informational Discussion with the Engineering Department.
Do Not use text.
Do Not use e-mail.
Do Not go to social jibber jabber web sites.
Yes Do , Speak with Engineering Department.
http://en.wikipedia.org/wiki/WYBE.