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First, make sure that your hold switch was activated when it turned on to make sure you didn't accidently hit a button.
If it was, then usually an iPod will turn on because its alarm was somehow activated. You may not remember turning it on, but it still may be. To make sure the alarm is off go to extras-->clock-->alarm clock and make sure it says alarm-->off
You may also want to check if the calendar alarm is on. To do this go to to extras-->calendar and make sure it says alarms-->off
That should stop the iPod from turning on by iteself
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