That’s a lot of people and potentially a lot of luggage.
What appears to be the pickup flight with presumably the same load two days before was flown at FL300 according to FlightAware and the return flight at FL370 then 390 and a brief climb when in the vicinity of a late afternoon thunderstorm.
High altitude upset of an airplane that may or may not have been outside of its envelope to begin with.
https://www.globalair.com/aircraft-f...ons?specid=112