Some programs I downloaded from store can't open sometimes...

For ex,I downloaded ibooks in store for itouch4,but when I click it just flashed a second then it's normal screen,i just can't open this program,and also some other programs i downloaded,but this afternoon I opened these programs,and now it doesn't work again.What's wrong???

Try here:
iOS: Troubleshooting applications purchased from the App Store

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