T7 Shield 4TB drives were FAST - Now Extremely SLOW

[cableguy1970]

I have (4) T7 Shield SSD Drives, 4TB size, and all four used to work flawlessly. Now attempting to save data to any of the drives they are going slower than dialup. Over 4 hours to save 4GB. I've used Samsung Magician to ensure all drives have the latest firmware (FXI72P2Q). It's odd that they all are performing exactly the same way. I've used two different Mac computers with the same results: 16" MBP M3 Max, 48 GB Memory and Sequoia 15.4 installed. 2nd Mac is a 16" MBP M2 Max, 96 GB Memory installed. I also have a Samsung T9 SSD, and it's just as slow. Any help would be greatly appreciated.

[TheBiles]

I'm getting the exact same issue with a T9 on my MacBook Pro M4. Supplied cable, tried all ports, updated SSD fimrware. Nothing.  2 MB/s write speed. Confirmation from Magician: