rekorbox glich probleem

i have the same probleem with my rekordbox after 20 min starts glich noise and every new song mixing making bed and after 40 min cant hier master and cue. i have macbook pro retina 2015 . 8 gb ddr3. after changing buffer size for 1 min its ok then coms back the same problem i have tryed everthing reinstaled but nothing can help