XDJ-Aero wirless using Rekordbox issue

Hi. I can link up the Aero to the Rekordbox on my pc but when I go into the control panel on the Aero to use the rotary knobs to access the Rekordbox, it won't let me. I am pressing the rotary knob to access the part for my pc and rotary control but nothing is happening. It worked the other day but I can't get it to work now. What have I done wrong? Thanks for any info. Mark