problem with usb plugged in topic

Here is my sister note problem..

- The probl starts when charging a while then suddenly shutdown..
- screen shows battery logo.. Not a second again it restarted.. At this state battery not recharged.
- unplugged the usb, it started to bootloop, at this state power button working.
- rebooted into recovery, clear cache, dalvik even data and system still not working (bootloop)
- flasing another rom not working (bootloop)
- trying plugged usb while in recovery mode, working. phone starting to charged. (Usb work in download mode too)
- after a while charged i try rebooting still not working
- then suddenly miracle happen, booting with a tricky move. I hold the power button about 10sec it boot the rom..
- at this state power button not working.. Usb not working.. Power menu pop up a secend after usb plugged then shutdown itself...

I assume its not rom or kernel problems
Any solution what happen to my sister note?