Build date: June 2010---rules out a lot of earlier Service Bulletins.
LG gas dryers are ***very***sensitive to partially blocked/restricted exhaust venting.
If the venting runs/routes through the wall of the home (and is longer than 8 feet length)---this makes it almost mandatory that a professional vent/duct cleaning company be contacted/used---to verify that the vent system is indeed clear.
I've witnessed LG gas dryer flame/ignition shutdown in as few as 3 seconds.
In that instance---the venting went into the floor at a downward angle and then straight through to the rear/back deck of the home. The overall length was approximately 20 feet.
After the duct/vent company (using their expertise & specialty tools) completely removed all of the lint/water accumulation---the dryer performed *much* better but still required a longer than average length of time to dry the laundry. This was due to the longer-than-eight-feet length of the vent.
Another possibility---though unlikely---is that the Heater Relay on the Main Board may be failing (intermittently.
I'd check the vent system first.