HT1688 My Iphone 4 randomly shuts itself off and will not turn back on unless I preform a hard reset.

I have an Iphone 4 that will randomly shut itself off and then not come back on unless I preform a hard reset.  Also, it sometimes freezes up and needs to be reset in order for the device to begin working properly.  I have tried to back up and restore using itunes on my computer but I still have the issue.  Can someone shed some light on this issue for me and let me know how to correct it?  Thank you.  Randy.

Try to set it up as new device, this time without using the latest backup. If this does not work, contact Apple to get it checked.
Apple - Support - Service Answer Center

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