I have a Roku 3900RW, actually three I bought at once. They all run between 81C - 93C based on the secret screen function. I have gotten one below 81C to 79C by idling without the HDMI plugged in. This does not seem normal and guaranteed to eventually fail the units.
Any ideas if this is normal for this unit. The site seems to indicate 45C to 65C is normal.