It doesn't happen all the time...not all that often actually. Do a search, there's been 1000's of threads on it.
That dumb feature helped save us from having to pay the gas guzzler tax...so I LOVE IT! Love it even more now that mine is disabled.
There's an SLP plug that disables it or you can turn it off w/ a tune. As far as I know it's only on the LS3.