We are experiencing some frequent picture freezes with audio drop out on DTV, solution is to use Tuner A for a moment then revert to Tuner B again; All ok for maybe the rest of the day.
I have replaced the 23 year old MH amp and its external 4G LTE low pass filter with a new fully screened variant including an internal low pass filter at 16M on our comms tower where there is a high gain array for the sender 59KM away.
Better S/n and stable pic now DVB-T, but still the freezes persist.
Maybe the earlier driver for this tuner, as with the satellite side in post #23 in this thread.