o i made another test this morning:
1. turned on the rx3 loaded one track to deck 1
2. set an inital 4 beat loop
3. pressed play on deck 1.
=> 4 beat loop without any click sounds
5. then i loaded a track to deck 2
6. startet track on deck 2 in sync mode
=> track on deck 2 with 4 beat loop still active startet to make sporadic click sound.
7. i started recording with channel 2 volume set to 0 (but still playing in the background)
=> i uploaded it again to soundcloud. you can hear the sporadic clicks (use headphones or good speakers), sporadic clicks occured more often when playing with loops or beat jumps on deck 2=>you can hear much more clicks startin from about 1:00 .
i really hope that you can fix that soon with a firmwareupdate. but it seems like the proccessor should be more powerfull :(