PSW110 Durablity

A PSW110 Subwoofer I purchased in 2011 unexpectedly stared making terrible and loud "static" buzzing sounds, even with the audio cables unplugged. This is now the THIRD issue I've had with this product. 1st, was shipped to me in a damaged condition (purchase new, not refurbished), exchanged free of charge after 2 weeks of waiting. 2nd time, just a year later, the amplifier had to be replaced because of the loud static sound. (Of course, I had to do the work). 3rd time, the amplifier that is only 2 years old has fried again. This sub was minimally used, and sat 24/7 in my climate-controlled living room. Called Polk Audio support, and they said I have to pay to replace the amplifier (yet again), since the warranty begins at the original date of purchase. Now I'm faced with paying more for a replacement amplifier than I paid for the original product years ago. Was truly a Polk fan, having spent thousands of dollars on their products. It is very disappointing to see how many other people on forums have had similar issues with this product. Unless strongly persuaded otherwise, I will 100% purchase competing brands in the future.