So I just got a new Onkyo TX-SR313 receiver to replace my old Onkyo. The new one seems to run so hot that it shuts itself off periodically. It's in a component rack that is completely open on all four sides and has several inches of clearance between the top of the unit and the next shelf up.
At first I thought I might have a short in one of my speaker wires. I checked all of them and they all seem fine. My next step was to just place a floor fan down in front of the unit to see if overheating was the cause. With the fan present, I had no more shutdown problems for the rest of the day. Once I turned the fan off, the unit shut down again in less than half an hour. Fan back on, no problems again.
I obviously can't keep a floor fan laying on the ground to keep the unit cool. Does anybody have any suggestions for other cooling solutions, preferably inexpensive ones? I also would like to avoid too much fan noise, if possible.