It is unclear whether these are isolated cases or whether this occurs periodically
GeForce RTX 30 video cards were quite problem-free at one time, unlike the same RTX 4090. However, it is now being reported that at least the RTX 3080 FE may have problems with the cooling system.
One of the Quasarsone forum participants discovered significant defects in the cooling system of the reference GeForce RTX 3080 Founders Edition. Disassembly showed that copper oxides had formed on the CO radiator. The chamber clearly leaked, which caused chemical reactions that led to quite noticeable consequences.
The GeForce RTX 3080 and RTX A6000 were found to have leaks in the vapor chambers
Similar defects were quickly found on the Nvidia RTX A6000 professional card. At the same time, on the one hand, so far we are talking about these two instances, on the other, the identity of the cases suggests that the problem may be much more widespread.
At the very least, this is another reason to better check video cards when purchasing them in person.