I’m using 2 Avermedia A188 Duet White box version cards for a total of 4 tuners.
This is the only channel I have problems with. All the other channels record fine and I frequently record 3-4 programs at once.
When checking in the “History” section of Recorded TV. I can see that Media Center tries to record on the Tuner #1 when that fails it moves on to Tuner #2 then 3 and finally 4.