Been regularly reading this thread with much interest. I have the same fate with armymanhaha, same difficulties, same amplifier problems. My amp is NAD375bee (without the DAC).It's been with me for 26 months now, and at times switches itself off -to borrow his words 'self protect mode'. The first sign occurred a year and a half ago, I somewhat ignored it then kasi bumabalik naman if I turned it on ulit, as if nothing happened. The problem occured with increasing regularity as months passed. Fortunately, balik normal naman siya, kaya lang, it will take time na, siguro 30minutes to 1hour. With the help of Rex, I began to entertain thoughts of sending it to the dealer for repair. With my physical condition, malaking abala para sa akin Kung dadalhin ko ito sa manila, i could not even carry the amp.
Until now the problem persist. Just yesterday, bigla siya namatay, but after disconnecting all the speaker wires and IC - nag on ulit siya, after about 30+ minutes, na parang wayang nangyari. Hindi ko talaga alam ang problema, kasi bumabalik naman siya after some time. I was ready to buy the NAD M51 DAC, kaya lang on hold muna Ito. I sensed na mas kailangan ko ang amp ngayon, Baka bumigay na yong 375 ko. I really like the NAD, kaya I'm looking at their M3. Second on my list is Naim Supernait2.