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This happened to me with a samsung t7 and my MBP. In the end it was a bad usb-c cable.

Same for me, but MacBook Air M1 and T7 Shield. But it doesn't always seem to be the cable. One of Samsung's was definitely broken and they replaced it, but it keeps happening with other cables too.

Was it a name-brand cable? Can you name names?

I was originally using the cable that came with the drive.

At some point I kept plugging it my Macs and sometimes it would go slow speed USB, and sometimes it would go to 10. I was plugging it into a CalDigit/OWC hub (depending on the Mac) and directly to the machine.

After realizing what was happening I just picked up a 20gbps (or 40, I can't remember) cable off of amazon and the problem went away.

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