DISK NOT EJECTED PROPERLY keeps popping up Big Sur 11.3.1

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After updating to Big Sur 11.3.1 my MacBook Pro 2013 keeps ejecting my 2TB Seagate external drive. As a result, I'm not able to back up using Time Machine. Would be happy to get support for this issue.

DISK NOT EJECTED PROPERLY keeps popping up Big Sur 11.3.1
 
 
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