Samsung NX58H5600SS range barely boils water

Hi all.

Our brand new Samsung stove takes over 20 minutes to barely boil 3 quarts of water, then never gets past a low boil (on the "power burner" or any other burner). The flames are blue...except once a few days ago when in the middle of cooking they turned yellow. Since then, they've been blue again. It's professionally installed, with LP conversion professionally installed and correct LP orifices checked multiple times. Simmer calibration professionally adjusted.

Videos:

• Normal operation
• The one time flames turned yellow

So far:

• The gas company came and confirmed that gas pressure was good at the burner (12" WC)
• The Best Buy technician changed out the regulator in the stove

Everyone is stumped. Anyone have any insight please?

via Samsung NX58H5600SS range barely boils water
by samhandwich