Same here. Seagate 2TB and 4TB on MacBook Pro 2018 running Big Sur 11.6. The 4TB ejects every now and then, but of course always at the wrong moment, like when finishing a complicated video edit. The 2TB disk (my Time Machine disk) is the real PITA, ejecting umpty times a week and in the process screwing up Finder and other apps that are running, only to be fixed by forced reboot. Started with Catalina. Disks are ok when checked in Disk Utility and work fine on older MBP running High Sierra. Apple, please fix ASAP!
patio
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