https://www.xpg.com/us/xpg/681?tab=specification
2. This product is backward compatible with PCIe 3.0. If a third-generation PCIe motherboard is used, this product will be able to achieve sequential read/write speeds of 3400/3000MB per second.
look to me the motherboard don't like this m.2, return and get another brand
Could be this the problem
motherboard support
1 x 2242-2280 (at front)
supports SATA & PCIe 3.0 x4 modes
‧ 1 x 2242-2280 (at rear)
supports SATA & PCIe 3.0 x4 modes
the xpg s50 is PCIe 4.0 x4 nvme
maybe that backward compatibility doesnt work?
https://www.xpg.com/us/xpg/681?tab=specification
2. This product is backward compatible with PCIe 3.0. If a third-generation PCIe motherboard is used, this product will be able to achieve sequential read/write speeds of 3400/3000MB per second.
look to me the motherboard don't like this m.2, return and get another brand