Ubuntu 16.04 - Crashes when switching between worskspaces using CTRL + ALT + ARROW Key

[Mark]

I'm using Unity (default for Ubuntu 16.04)
I have four workspaces 2x2.

Often when I have chrome in full screen in one workspace (0,0) and then the workspace next to that (1,1) could be something like sublimetext or another program e.g could be a chrome window (but in 1,1 its not in full screen)

When switching between these two workspaces using

CTRL + ALT + -> to move from 0,0 to 1,1

and CTRL + ALT + <-
to go back.

It causes Ubuntu to COMPLETELY FREEZE. And if it doesn't come back within say two minutes (which it rarely does, it basically does all the commands which were done while it was frozen in a couple of seconds).

Alternatively, I have to restart using
ALT + SysRq + R + E + I + S + U + B

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What I have tried:
- Disable hardware acceleration in Chrome.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1746576/+editstatus and add the package name in the text box next to the word Package.

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