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.
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