Got the same problem on 16.04. It seems the issue was caused by Unity upgrade 
to 7.4.5.
I manually downgraded it to 7.4.0 and the issue was gone:

sudo apt-get install unity=7.4.0+16.04.20160415-0ubuntu1 libunity-
core-6.0-9=7.4.0+16.04.20160415-0ubuntu1 unity-
services=7.4.0+16.04.20160415-0ubuntu1 unity-
schemas=7.4.0+16.04.20160415-0ubuntu1 compiz-
compiz=1: compiz-plugins-
default=1: compiz-

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  UI scale being reset to 1 everytime when display sleeps for a while

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