IMac keep ejecting my 2TB external HDD but in safe boot mode it is totally fine. How to resolve the problem?

Hi,
I have WD 2 TB external HDD. It has two partitions, one I use for my time machiine backup and one for my personal files and documents. Recently the iMac keeps ejecting the external HDD as soon as it gets connected to the iMac. I tried to reboot the computer in safe boot mode (by holding down the shift key at startup) and found out that problem is not there anymore. I can access my external HDD there and it never ejects the HDD.
It seems like the HDD is fine, the problem is with the iMac. Can anybody please give any solution to this problem?
Thanks!

Thanks Allan for your reply!
It makes sence that there must be some log in /start up item which is causing this problem. I went System Preference>Users & Groups> Login items> disabled all the items there to make sure, and restarted the computer but the problem is still there
Is there any other way to stop/configure the log in items?
Thanks again!

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