WD Passport 1TB unmounts itself all the time

I get this once so often: "The disk was not ejected properly. If possible, always eject a disk before unplugging it or turning it off."
I have done the following (to debug/fix) and it stills ejects itself.
- Upgraded OSX to latest version
- Upgraded WD Passport to the latest firmware
- Installed WD Drive Utilities and set the physically sleeper to never
- Unchecked "Put hard disks to sleep when possible"
- Computer sleep set to "Never"
- Checked health status OK when drive is connected (not really an issue since I know the disk works fine with PC/Windows)
About my drive
- External WD Passport 1TB USB 2.0/3.0 - uses USB as power supply
- Worked like a charm for several months on my prior setup (PC/Windows)
- NTFS drive
About my system
- Running iMac (late 2012) w/ latest OSX
- Tuxera NTFS for read/write to my NTFS drive
- Parallels (uses bootcamp partition) running on the side - usually writes data to the disk.
My disk could be up and running for 30 minutes to a couple of hours.
I cant just unplug and replug the disk whenever unmounted - I have to wait for at least 15 minutes or so.
This is really terrible - I'm a new Mac user and this is a deal breaker for me. I'm considering using my expensive iMac for Windows only - just to make my hardware work...

I've seen that post earlier but it didnt help me. I wish I had installed the WD APP. Unfortunely, I haven't. Don't know how to install it even.
The tools I've installed and tested for my WD drive got installed after the unmounting error began, so it can't be that causing the trouble.
Now my drive just got unmounted by itself again, so I'll have to wait half an hour to hook it up again - then I will look for a WD app on the drive itself - but I doubt I find any. (To install it, then maybe uninstall it...?).
Open for any suggestions... - except formatting my two day old iMac.

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