Reply to audio drops in browse mode s4

sooo my dj partner in crime and I are having problems we use 2 seperet s4 controllers not sync togeather and on there own comps we beatmatch them manually going back an forth from s4 to s4 and run there own main outputs to there own channels on the mixing board we are having audio drops and lagging on both systems only in browse mode we get audio drops and in non browse mode if u turn the browse nod you get lagging other then that everything works fine its just the browse function any help?