Thank you Jpfe8851 By the way, I'm only using the default player. The problem occurs while the default player is playing music. I myself even haven't installed any app. I think I'll stay with 1.3.7. It works and is enough for me. If some day I'm eager to go to 1.4.2 again I'll do the hard...

ok, my testing shows: the problem with going to deep shutdown 1 or 2 minutes after dimming the display is a fw 1.4.2-problem. With FW 1.3.7 restored the problem is gone.   Well, dear iBasso, please be so kind to make a tiny modification to your FW 1.4.2!

I have a fairly strange problem which I didn't find mentioned in this Thread til now. I bought DX100 when 3d Batch was on sale and since then worked thru all updates. I used the device very very very seldom because I mainly use PC-DAC-Headamp-HD-800. But at least the DX100 seemed to work...