Hi, I've had the 306 SACD for a couple weeks now and have not experienced this problem. My rack is fairly well ventilated, but I doubt that would really be a culprit. Is your player hot to the touch? Mine runs luke warm.
As for music making, it is in another league from the Cary 303-300 and the 306-200. Red book CD playback is amazing and SACD blows my socks off.
The sounds is liquid, with the swell and flow of live music. The bass end is sub-terranean and the high frequencies are smooth and extended. Really incredible to hear this level of performance.
The sound stage has opened up with break-in. It is as high, wide and deep as my analog playback.
All the audiophile attributes aside, it is a joy to listen to the 306-SACD.