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e260R dying after USB disconnect

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cothrige:
I am sorry if this is the wrong forum, but my questions seemed not to fit any of the others according to the posting policies I found in them.  I hope I am in the right place.

Yesterday, I connected my e260R to the USB cable in order to copy some files over to it.  I used the normal process I always do, turning it off and then connecting, and then mounting it on my filesystem.  After I copied the files and got things where I wanted them, I umounted, waited for it to disconnect, and then unplugged it.  Normally, this would, after a very brief pause, prompt a screen saying something about rebooting or restarting (I can't remember which) and it would then do so.  However, on this occasion it simply went black and very, very dead.  No buttons did anything at all.  If I plugged it back in it would boot into the original firmware and then be mountable again, but upon disconnect it would simply go black again.  I went through this several times, hoping it would respond eventually, but had no luck.  I finally pulled the battery, as a last ditch, and fortunately that seemed to kickstart it.

I am wondering if this has ever happened to anyone else.  And what could cause it?  Is it hardware related perhaps, or could it be the firmware, either original or rockbox?  

Thanks for any help.

RCM:
How old is it. It could also be that the battery is not holding a charge anymore and needs to be replaced

cothrige:
I have had it for six months, and I haven't noticed any obvious problems with it in that department.  And that possibility as a cause hadn't occurred to me, so I hadn't really looked closely at that.  I will charge it up tonight and run a battery benchmark to see what I get.  Maybe I am having a problem that I haven't even noticed.

EDIT:  Okay, Last night I charged the device fully and started the battery benchmark plugin and then ran the device down overnight.  It would appear that something is going wrong as it ran for only 4:09:04.  The battery really does seem to have run down as when I tried to start it this morning it reported low battery and then refused to start, but the battery_bench.txt has 61% with 9:09 time left and a voltage of 3853 at the end.  It looks like the thing just conked out in the middle of the charge.  I wonder why it stoped with 3853 still showing for voltage?  That really kind of surprised me, as I had expected that to drop all the way regardless, and especially if the battery is not holding a charge.  Any ideas of what may be going on here?

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