A China Southern Airlines Airbus A321-200, performing flight from Shenzhen to Luoyang (China), experienced loss of communication.

• Aircraft was climbing out of Shenzhen when the crew stopped the climb at 6000 meters (FL197) and began to squawk loss of communication.
• The aircraft returned to Shenzhen for a safe landing about 35 minutes later.
• The airline reported the crew dealt with a short term communication failure and decided to return to Shenzhen as a precaution.
• A replacement A321-200 registration B-6379 reached Luoyang with a delay of 2:45 hours.