When I was making music, I realized that randomly during playback most of the sound would come through one monitor, not all about 90%/10% . When I would pause/stop and replay, it would be back to normal. It continued to happen randomly over and over. IDK if it's b/c my computer's weak and I had a handful of VSTi's, but my disk usage was low, memory and cpu about 55%; unless a new VST was loading. I'm in cuabase