They screwed up their receivers circuit board from 2009 to 2015 ish. All their receivers would fail after 5 years and Onkyo did a massive recall campaign to replace the main circuit board (with all the amps attached.) That must have costed them.
https://en.wikipedia.org/wiki/Capacitor_plague
I had an Onkyo from the bad cap era that blew its capacitors, it was maybe 15 years old when it died, FWIW..
There have been multiple capacitor plagues. E.g. in the late 80s/early 90s SMD electrolytics entered the market and these had absolutely atrocious reliability because their lead seals kept failing, so they'd empty their electrolyte into the PCB. Before that the Japanese brands had a plague. Philips "blue axials" had a plague in the 70s/80s. I don't remember the brand right now (small, red-cased caps), which also had a plague in the 80s. Rifa MP safety caps have had moisture ingress issues and associated explosion and fire issues since forever.