Problems with screen enlarging so big I can't use touchpad and phone locks up.

After getting iOS 7, I have had an issue with some sort of technical glitch with my screen on my 4S.  On occasion (today) the screen pops to a huge display and does not allow me to scroll enough to do anything.  I can't enter my password because the screen won't scroll enough, I can't shut down or override because the shut down doesn't work.  It took all day to finally shut down from the touchpad today. Is this happening with anyone else?  How can I override this problem or fix the problem without purchasing a new/upgraded phone????

http://support.apple.com/kb/TS3129

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