Bad signal/pixelation on channels 6 (ROAR) and 296 (MeTV) out of Providence.

For the last week or so, these channels (6 and 296) have had quality issues -- audio and visual interruption, pixelation. It's not a constant problem -- can watch/listen most of the time, but lots of words are dropped, image freezes. Similar to what one might see during a storm. 

All other channels are fine. I did a restart and system refresh, didn't make any difference. Is this a known issue with these channels?... is it going to be fixed?