Reply to CDJ-2000's "Play" function is very delayed, but ONLY when the other deck is playing

hey guys.. i experienced a similar problem a few months ago, and it seemingly disappeared on it's own.. i'm not sure why or how this is happening, but i was hoping that somebody could help me find a solution.. this is what's happening..

-Deck 1 is playing
-I go to hit "Play" on Deck 2, and the red "NEEDLE" light on the CDJ-2000 Nexus display appears
-Deck 2 waits about 1-2 additional seconds, then starts to play

ONLY when Deck 1 is completely finished playing, do I gain full functionality back to Deck 2's "Play" function.. now the same problem switches decks, and begins happening on Deck 1..

i'm not sure why this is happening, I haven't made any major changes.. i just want the "Play" feature to work on both decks, as soon as it's pressed, like it should.. any help?