My Passport For iMac 4TB visible but not opening after sleep/close down

My Passport for iMac 4TB works fine when it is connected to the iMac. However after the iMac sleeps and I have to enter my password, it is still displayed in finder but will not open. I have to physically disconnect and reconnect for the iMac to find it. Any ideas.

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Unable to complete backup. An error occurred while creating the backup folder. Same problem after Mac goes to sleep. OSX 10.11…

I’m having the same issue. I think it’s some kind of problem with the My Passport drive and macOS.

Would love to find the solution also!