Some problems I have with my iphone 5s?

I have some problems with my iphone 5s that would like to state here hope to get the solutions for them:

1- My iOS version was 7.0.2 and I installed some good apps on it, then I updated my iOS to version 7.0.3. After that when I tap some of my apps, first page of them appear and then they immediately vanish and don't go to the app, in other words, they don'r work (some of them of course). Does anybody know how to solve it?

2- I should recharge battery in what (5, 10 or 20) percentage?

Take your phone back to Apple store at the mall and ask to have a replacement, if you bought it less than a year ago, there policy is supposedly no Questions asked.

First, go to settings and then software update and see if there's another update available to you. The iPhone users in my household got an update within the last few days that fixed some issues.

Second, try turning your phone off by holding the home and sleep button down until it turns off. Then turn it back on. That sometimes fixes minor issues.

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