https://www.yahoo.com/news/spacex-falcon-9-rocket-suffers-054346132.html
Musk referred to the anomaly as a "RUD," a tongue-in-cheek acronym that stands for "rapid unscheduled disassembly."
"Upper stage restart to raise perigee resulted in an engine RUD for reasons currently unknown," he said on X. "Team is reviewing data tonight to understand root cause. Starlink satellites were deployed, but the perigee (orbital low point) may be too low for them to raise orbit. Will know more in a few hours."