Over the past 3-4 weeks I have noticed my sub has become "weak" sounding. I maybe use my home theater system 7-10 hours a week and recently had a warranty claim on my AMP for my sub in January this year (2018). The symptoms at that time were different; the sub would work for an hour then start to cut out. Over 3-5 weeks it went from an hour down to 5 mins. I did a warranty claim and Klipsch said it was a bad AMP and replaced it since It was just 1 month before my warranty expired.
Fast forward to now, I have been noticing lack of bass response from my sub. I get home turn everything on bass sounds GREAT, strong and thumps hard! After about 25-35 mins the bass starts to diminish. I can turn the volume up on my receiver but it doesn't make a difference. This happens if I listen to music or watch TV. It also happens on multiple inputs (Bluetooth, Blu-ray, cable/sat or game/xbox). I only have time to watch about an hour of TV a day so at that point I turn everything off, come home from work the next day and notice the same results. I have also noticed over the 3-4 weeks my sub has just turned off on its own; maybe 1-2 times; not while in use but when I am at work and no one is home. (I have the switch on the back set to "ON" and not auto). No front LED light is on, and turning on my receiver doesn't not kick on my sub, the only way to get it working again is for my to either remove power cord from the wall or back of sub. The back AMP plate is warm to the touch but isn't hot. So I am here looking for any answers or help; below is my setup.
Marantz SR5010
Klipsch RP-240S
Klipsch RP-440C
Klipsch RP-250F
and of course Klipsch R-112SW