No manufacturer releases a procduct with known "issues".
"Issues" are only discovered when the product is in the field for a period of time and cutomer complaints start to pile up.
Hopefully, te manufacturer takes steps to correct these "issues" in future releases of their product.
That being said, dollar for dollar, Onkyo has more features than competitive receivers. Onkyo has higher power ratings tan competitive receivers and, Onkyo also has more problem complaints here than other competitive receivers, mostly heat related.
Having read your last post, you may want to strongly reconsider the advice offered in this thread, particularly in post 10.
But, in all fairness, ALL receivers need a few inches on top and, hopefully, alongside them. Air comes in from the bottom and sides and the heat vents from the bottom up, out the top of the unit. Blowing air on the back won't do squat.