Voltage issue?

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http://forum.xda-developers.com – I took my phone out during Sandy (I know dumb) and it got ruined. I got everything dry and now when my phone is below 70% it shuts down as if out of power. It goes into the boot screen, screen then flickers then goes black. It wont boot completely unless it is plugged into AC power. I reflashed rooted FI27 but same issue. Any suggestions? (HowTos)