A Reddit user reported a similar incident again with his MSI GeForce RTX 5090. In both cases, the GPU's 16-pin connector melted in just a few weeks.
Redditor Witnesses Melted 16-pin Connector on MSI RTX 5090 Twice; User Says He Used Corsair SF1000 PSU and the MSI Adapter To Power the GPU
It's not just the Ryzen 7 9800X3D owners who are suffering from burnt CPUs over and over again, but it's the same with the RTX 5090 owners, too. Seeing melting 16-pin power connectors on GeForce RTX 5090 is quite common, but as a user, seeing this twice back-to-back is definitely frustrating. In a lot of cases, it was user error, but in others, it was due to a combination of factors that led to the melting of connectors. Thanks to the poor design of the connector, it's easy to get it melted in no time,