Hate to say it but maybe your hearing? I started having a problem over this past winter where the right side seemed slightly muted at times. Soundstage seemed shifted to the left. Barely noticeable but frustrating. It took maybe a month or so to realize that I had some tinnitus starting in the right ear. Nothing wrong with my gear/setup.
How loud do you listen? Could be after a few hours you start having auditory issues
How loud do you listen? Could be after a few hours you start having auditory issues