You mean that during recording of keys there were duplicates due to environmental noise, that recorded itself and then plays itself?
I looked at settings, there are no duplicate entries, only the individual keys I recorded.
Could it be triggered by heat during media playback the HTPC gets hotter and the flirc doesn't like that?
I've seen posts here where people cover the flirc with tape to keep stray IR out, I could try that?
P