Of the six channels on RF 26, 10.2, 45.1, and 45.3 are perfect, while 45.2, 45.4, and 45.5 are unwatchable, going from pixellated to a black screen and back. It happens on all my TVs, including the ones connected to an outside antenna. It's been happening since at least 8 AM this morning. No issues over the weekend.