MacBook Pro goes to sleep when copying files from attached drives

I have noticed that since installing Yosemite my MacBook Pro goes to sleep when it is in the middle of copying a large number of files.  When I wake it up the copying continues.
I have also noticed that when I am watching videos from my shared iTunes library on an Apple TV the video will stop after about 15 minutes and the connection to the library is lost because the MacBook Pro has gone to sleep. When woken up then access to the library is restored but I need to reselect the movie and then resume.
I have changed the power saving options to do not let drives sleep when idle and do not sleep laptop.
Anyone else have any experience of this or better still a fix.
Thanks in advance.

I have just found that if I turn off the display sleep in the power settings then the problem is resolved.  It means though that the screen on my MacBook Pro is on all the time albeit with a screen saver.

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