Why does my system hang and require a power-cycle?

My macbook air just stops. The trackpad, mouse, keyboard are all inoperable. The cursor does not change to the "I am busy color wheel". We have reset the SMC controller once on a suggestion from Apple support. This happens regularly and we are getting REALLY aggravated at the lost time and data.

Cineast wrote:
If you tell me to reload the operating system, then I'll have to go retro with Snow Leopard.
All subsequent updates were purchased from Apple on the Internet and downloaded.
Not so. You use the recovery mode to reinstall Lion. Details in Recovery and About OS X Recovery. Also, see Computers using Internet Recovery.

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