Looking for some ideas here. This evening while watching the season premiere of '24' my Paradigm Seismic 10 all of a sudden started thumping - whomp, whomp, whomp at a regular interval every second or so. Quickly switched it to OFF (usually on Auto). Turning it on again the regular thumping continues. Switching the input switch from RCA to XLR and the thumping continues. Adjust the sub volume dial to minimum and - yep - thumping continues. I've since unplugged it wondering if it will reset. But I'm hesitant to turn it on again until I have an idea as to what might be the problem. All thoughts welcome.