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@vermontcathy shows a Kindle 2 device which may be different from the K3. Again, referring to the disassembly video (link posted above), the switch on the K3 is a simple flat piece of plastic that slides over a microswitch. The spring is similar to the top of a shepherd's crook with very light tension, and as such, shouldn't be subject to weakening over the life of the device. Either something has gotten embedded in the switch channel, or a piece of the switch has broken off and impeded the slide channel. There is virtually nothing to go wrong with the design absent external debris or physical damage. The switch and channel shouldn't be subject to wear under normal use. If it were my device, I'd take it apart and see what's wrong.
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