2001 buick lesabre

i recently purchased a 2001 lesabre limited. twice while driving on the freeway, it has died. i pulled over and it started right away. the dealer says that they have no idea what is wrong but think that it may be a
battery connection. has anybody else experienced this and if so what was the problem
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Clean and tighten cables, especially all the grounds. After that this could be a tough problem, any particular thing that seems to trigger this?

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I had a vehicle that did just that and believe it or not it was the coil. When it overheated it just shut down. Just a thought.
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