When will SpaceX's Falcon 9 rocket return to flight after 4 upper-stage issues in 19 months?

For the fourth time in the last 19 months, the upper stage of SpaceX's Falcon 9 rocket experienced a problem during a mission ...

SpaceX grounds its Falcon 9 rocket after a problem with its upper stage. Will the Crew-12 astronaut mission be affected?

SpaceX has temporarily grounded its Falcon 9 rocket after an upper stage failed to deorbit as planned during a Feb. 2 launch.