Bose lifestyle 20 sound cuts off. My bose lifestyles 20 system powers on fine then the sound will

Question

My bose lifestyles 20 system powers on fine then the sound will cut off after about 5 minutes. If I turn the power off then back on the system will cut the sound off after about 5 to 10 seconds. If I turn the power off and let it set for about 15 to 20 minutes before powering it back on it will again stay on for about 5 minutes then cut the sound off. I think the system is overheating but not sure where to start (head unit or base amp) or what to do or check for. Any assistance in this matter would be appreciated. Thanks for any help.