Thanks for the info provided about this issue!
I recently noticed that my NextPVR OTA recordings of WCNC began failing due to no signal beginning on 1/28. I live about two miles from center city Charlotte and normally WCNC is one of my strongest and most reliable OTA signals, with typical SNR in the green around 24-26 with an indoor directional antenna.
This afternoon I could not acquire a signal.
However, this evening the signal is there, but weak, so I was able to record the evening news, with SNR in the yellow zone, below 20. Some dropouts, but the recording completed normally.
The good news is that the Super Bowl is being broadcast on WJZY, which is still coming in loud and clear, so no hurry ... :-)