Rekordbox live performance issue

Hello dear friends I am new to rekordbox and the happy owner of xdj rx 2 controller, I tryed to play with my laptop ( Asus Rog G752VS i7-6700 48GB RAM 2x NVME SSD gtx 1070 8GB win 10 ) and rekordbox become unresponsive and and freeze the audio in speakers if I click on another task than rekordbox for example If I open a folder or chrome or wifi button. The track is playing but freezing and lagging. Does anybody know what can cause this issue ? thanks !