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We have been having issues with the PAFL bus too. About 2 months ago the PAFL selection was following the “SEL” button. For example on a specific channel “PAFL” was on and the monitors were working. The channel was selected as indicated by the “SEL” button (I have the “SEL” follow the PAFL selection turned on in the settings). Out of the blue, the “PAFL” started following the “SEL” button. I think this happened a couple times, and one time it corrected itself and another time I needed to reset the IDR-32. The bus was also totally going away at points too(just like the original poster).

Our system is a T80 connected to a iDR-32. It was firmware version 1.71 at that time.

I thought may have had something to do with the firmware. I upgraded to 1.80, and everything was fine for some time. Then out of the blue a couple days ago, the PAFL cut out again (no sound to monitors) for about 20 mins then came back.