Ed has bought three AV receivers over the last five years, and all three have died in less than two years. Leo says that adding a surge suppressor that does power conditioning and an uninterruptable power supply will guard against "dirty power" and power spikes that can happen after a power outage. It's not normal for AV receivers, or any tech, to die too quickly and consistently. So it points to something other than the device itself. Leo also recommends not putting them in a sealed cabinet, which can cause overheating. You can also look for a line conditioner. Tripp Lite makes a really good one.
Other than that, maybe it's just bad luck.