There is a bug in IOS 5.1

[itzman]

It just happened to me today when I clicked home burton like search in my iPhone 4S the keyboard remain and did not disappear even after pressing home burton a couple of time. it only disappeared after i click another app without keyboard. I replicate this a couple of time and the problem was still there.

 

[terrywfoster]

Not having that issue on my phones running iOS 5.1

 

[phreebsd]

i have this issue on 5.0.1.
has happened twice.

"keyboard remain and did not disappear even after pressing home burton a couple of time. it only disappeared after i click another app without keyboard"

 

[Arelunde]

After this happens next time, do a hard reset. This might take care of the problem...

Hold down power & home button until white apple appears. Then let go.

 

[roxxette]

Since the first ios 5 beta these happends , for me more common on my ipad i reported way back but....