My panel light is flashing along with the ABS light then the car will shut off.

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My 2009 Chevy HHR panel light will start to blink,along with the Abs light,then the car will just shut off on it's own. after 5 mins. or so it will start back up with no problem. This is dangerous because I don't want to be on the highway when this starts. Took it to the dealer and they can't find the problem because it will not do it for them. but I have been having this problem at least once a month. Help!!!!!!