I have a new NX-70V that goes un-responsive every couple of days. The power switch light stays green, there's no way to turn it on or off without doing a soft reset.
This happens most in my Targus belt case, but twice it's happened in the craddle.
It's not the hold switch, I checked. But speaking of that, I'm trying to get into the habit of engaging the hold switch before putting it in the Targus case to see if that helps.
I have been using an NX70V for quite some time and haven't had this problem. I too use the Targus belt case. I am wondering, do you leave it on inside the case, other than to play mp3's?
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"Tell me what you eat, and I'll tell you what you are" Brillat-Savarin
I haven't used the MP3 player much so no, it's not usually on in the case. What makes me scratch my head is that it does this even when sitting in the cradle.