Tuning issue with 2 Connecticut OTA channels

I called TiVo Tech Support about this last night. No resolution but they opened a ticket (04850478). I have been getting TV using an antenna for several years, and suddenly both of my Roamio 4-tuner DVRs stopped tuning in 30.1 (NBC Connecticut) and 30.2 (Cozi TV). I can watch these stations on the Roamio boxes over 35.3 (and 30.3) and 35.4, but I am not aware of a lineup change and my other TV (Roku Smart TV) on the same signal feed still tunes these stations in on 30.1 and 30.2 as before. This is very strange and isolated to these stations (on RF 35). All of my other stations are fine. Anyone have any idea what is going on here?