IMac won't shut down after using Time Machine

Here is the thing: My iMac (late 2009, 24", 8 GB RAM) won't shut down when I use my external HD for Time Machine. After the back up I try to eject the external HD but the icon won't disappear on the screen, it only gets blank and is not clickable anymore. It is still visible in the menu of the Finder but with no ejection sign anymore. Programs that were open before won't close even if I use the forced shut down function. But it seems like they are closed as they don't appear on the list anymore. When I then try to shut down the whole system the screen goes black and the wheel turns for hours! So that I finally have to shut it down manually.
This happens only after using the external HD for the back ups and when I then try to eject it. If I don't eject it everything goes normal. If I don't connect it everything goes normal. Sure, you might say, hey leave it plugged in then. But as it is a 3 TB HD I also use it for my MBP so I have to eject it
Is this a known issue or a bug in the system of Yosemite? With Mavericks everything worked really well - no problems at all. On the MBP (late 2011, i7, 8 GB RAM) it also works well. So I am kind of annoyed the I always have to shut the iMac down manually which can't be that healthy for the system.
Any insights on that issue are highly appreciated - thanks a lot!
Birgit

Okay, just realized that the same problem occurs with the MBP after rejecting the external HD
Icon gets blank, cannot be clicked anymore, while shutting down the MBP normally the screen goes black and the wheel is turning forever but nothing else happens. So I have to force it to shut down.
It seems to be a general problem with connecting an external HD once in a while for doing a time machine back up regularly and then eject it. So the question is: who has the same problem or does everybody have their HD permanently connected to their Macs for Back ups? Either by USB or WLAN? It never was a problem wit Mavericks and I don't want to permanently back up my system every hour - once a week is good for me BUT this cannot be adjusted in the time machine settings which would be a very good idea.
Any solution is still highly appreciated !!
Thanks a lot,
Birgit

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