Battery died while charging

[jds580s]

I know some people have had battery drain issues when charging and talking on the phone at the same time.

But, last night my phone was down to about 5% left, so I plugged it in, turned it off and went to bed.
Then at 3:15am I awake to the WM 6.1 boot-up sound. I thought it was odd so I looked over to see if any update had installed and forced a reboot or something.

What I saw was the battery was at 0% and charging. The phone was cold to the touch, with the house was set at 65 degrees. If it had been warm, I would have thought the battery overheated and stopped the charge, but that doesn't appear to be the case.

After the reboot it started charging right away without me doing anything.

Anyone else see something like this happen?