Many times thats the case wether the amp isnt putting out enough or isnt getting enough. Also check your rca cables i know it sounds stupid but i almost bought a new amp but tested and relized my cables were bad. You may not be able to notice it unless you try other rca cables. About 6 months ago my amp would clip after about 20 on volume. Wierd how it works but it fixed itself with new rca cables.