iPhone 4 Home Button Problem

Some iPhone 4s develop a problem, often after only a short period of use (possibly two months), where the Home button intermittently doesn't work &/or a single press acts like a double click (i.e. enters fast app switching mode).  This unreliability in the Home button makes exiting apps or entering fast app switching a hit & miss affair.  Surprisingly, screen shot (click Power, Home) and reset (click Power, Home & hold) work reliably.  This suggests that the problem is in software.  On the other hand, iOS updates make no difference, although a replacement handset fixes the problem, suggesting a hardware problem.

Lengthy discussion at:

http://forums.whirlpool.net.au/forum-replies.cfm?t=1656252

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http://m.inhabitat.com/highviews-cryoenergy-system-efficiently-stores-energy-with-liquified-air/

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http://m.inhabitat.com/scientists-developing-heart-powered-nano-batteries-that-can-charge-your-gadgets/