Why does my iPhone 4s start locking up or flashing when I'm typing a message?

I have an iPhone 4s with an updated iOS 7. Every since I did the iOS upgrade, my iPhone intermittently "locks up" when I'm typing a message, text or email - by locking up, I mean it won't display the letter I am trying to type or when I try to backspace or enter something different, the screen flashes and will not do anything.  Anyone else having this problem?

Hi NancyC,
Thanks for using Apple Support Communities.  This article has some steps you can try if your iPhone 4s periodically stops responding:
iOS: Not responding or does not turn on
http://support.apple.com/kb/TS3281
Cheers,
- Ari

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