2012 Nissan Altima Burps?

I have a 2012 Nissan Altima. About 3 minutes after starting in the morning, the car will often “burp” as if a puff of air is pushed out coming from the bottom of the car. Everything with the car is fine, regularly maintained, dealership found nothing amiss. Any ideas?

You might want to have the undercarriage of the Altima checked. The last time I had a truck that did this…it turned out to have bent exhaust pipe. Pressure kept building until blew out the tailpipe. A clogged catalytic converter will do the same thing.