E72 will not switch off, keypad is backlit

About 2 months ago my E72 started not turning off when I tried to. The screen goes blank (ok), but keypad would become backlit, and the phone would not turn off. The power button then does nothing other than "buzz". Battery removal was the only option.
At the same time my wife's E72 started exhibiting similar behavior - but without the keyboard backlit.
Vodafone decided to replace both handsets, but now both new handsets exhibit exactly the same behavior.
This happens probably every 2 out of 5 attempts to turn the phone off.
Given that this problem has exhibited itself on four E72s, this must surely be a S/W, F/W problem?

I have this issue to. I noticed it in December right after the firmware update.
I have a bunch of other issues too, see my earlier post.

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Try:
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- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
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Apple Retail Store - Genius Bar

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Resolve these most common issues:
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http://www.apple.com/support/ipad/assistant/ipad/
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Ben2 wrote:
1. How do i find out which exact model my BB is? Because it will not switch on to let me go into settings etc.. As i say, although it won't switch off, it won't allow me in either - just get that error message.
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Ben2 wrote:
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Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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Ipad froze will not switch off

ipad froze will not switch off

Reset iPad
Hold down the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears
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See this Link for Troubleshooting iPhone Hardware
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E72 will not switch off, keypad is backlit

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