My iphone 4 has turned itself off and I cant get it back on, it had a full battery before it cut off.

My Iphone 4 has just turned itself off and I cant turn it back on. It had a full battery before it cut off so its definetly not the battery, however I have found recently that the battery has been running out really quickly. any ideas what to do? Thanks

Try resetting your phone:
Press the sleep/wake button & home button at the same time, keep pressing until you see the Apple logo, then release.

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