A Southwest Airlines Boeing 737-300, registration N389SW performing flight WN-2303 from Baltimore,MD to Oklahoma City,OK (USA) with 124 passengers and 5 crew, was enroute at FL340 about 120nm northeast of Branson,MO (USA) when the crew initiated an emergency descent to 10,000 feet due to the loss of cabin pressure. The aircraft diverted to Branson for a safe landing about 35 minutes later. The aircraft had suffered two more similiar occurrences in the 370 days, see Incident: Southwest B733 near Seattle on May 23rd 2016, cabin pressure problems andIncident: Southwest B733 near Jacksonville on Jan 2nd 2017, loss of cabin pressure