This happens to me all the time but it is not a click but a quick "blip" that is all the instruments sounding at once. It only happens with RT's not MIDI. I have diagnosed that it is the sound card in my computer "switching off"

I have mentioned it several times on this forum and tried everything that has been suggested - nothing works. I even sent a file to PG support and they couldn't hear the blip. As a workaround, I extend all songs by about 10 bars which gives me time to press my foot switch after the song finishes and before the blip. The foot switch is programmed with the spacebar which stops the song and prevents the blip.

Tony