My iphone suddenly switched off it won't turn on until usb pluged in

1.My iPhone4 instantly power gone 3times or 4 may be.(but battery 90% still remaining)
2.i tried power on button but it not turn on.
3.i tried get DFU mode but its not work.
4.it only turn on i plugged usb cable to phone.
5.then i tried restore to new ios 5.1 but problem was the same.
6.this problem not always effect me.one time per day may be.
7.battery life also good.2g usage 2days like.
8.what should i do...?

any ideas......?

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