I did have that same experience, perhaps 15 years ago with a very high-end AV receiver that failed after about 36 months, just beyond the warranty period. The manufacturer had moved on to the next model--cosmetic changees and more power but little else changed--and my model was discontinued. I figured it should be easy to fix, but, no. It seems this model of receiver had a very unique computer chip in it that had flaws, causing the chip producer to halt production. Moreover, there was no way to reprogram things to accept another chip. So, an AV receiver from an elite line of products bit the dust. Fortunately, my dealer, from whom I had purchased a number of components, took mercy on me and sold me another brand AV receiver at what I am sure was pretty close to his cost.
I have NOT had a similar experience with manufacturers of my audio equipment. I have upgrade my 1980s/90s system over the past four years, and everything I have purchased is working just fine.

