virtualinsanityva

I've had this happen about 6 times in the past 2 months or so. No issues until this May. I've taken it to the dealer and I'm told the the error code indicates a low boost message. I have another appt in less than a week. It goes away with restarting the engine each time. I've used the same supreme unleaded gas the whole time. I wonder what this is. BTW no aftermarket items have been installed on my 05/08 build vehicle. Any input?