[Q] Can't reboot after a freeze

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http://forum.xda-developers.com – Occasionally I need to pull the battery on my Note 2 due to a freeze. When I do the phone will not start up again till I plug it in. When I do plug it in, the battery shows as empty for a few seconds and then jumps to 30, 40, 50, or whatever % charge there is.After that start up is normal. If I shut it down, it powers up fine on battery power. Any ideas why this is happening. My phone is rooted but this hasn't occurred before last week and the Note 2 has been rooted since last December. It has the stock kernel. (HowTos)