“After a month of working perfectly, now my subwoofer shuts off after about 20 mins. I tried a brand new subwoofer, still the same. I have no sleep timers set, and have not changed a thing.”
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On my old Onkyo the subwoofer goes to sleep after a while if it is not receiving a signal. Have you changed what you are watching or what theater mode and maybe the signal isn't being sent to the subwoofer specifically?
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