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[MankyGitt <dnadruff@xxxxxxxxxxxx>]

I have this issue.
16.04LTS - this problem is very frustrating.
Previously, on the same hardware, running 14.04, and then 15.10 I did not have this problem: Display was reasonably stable - "reasonable" not "perfect" because there is a bug affecting HDMI output to 4K monitors where periodically the monitor will black out for a few seconds.

I never use the upgrade path for new distributions: I always perform a
clean new installation, and allow fresh hardware configurations to be
generated. This is not an "upgrade" issue.

Observations: I can use a mini-display port connection to the DVI-B input on the monitor (and forego the 4K resolution): In this configuration, the screen black-out issue does not occur. The placement of windows after screens blank is an issue.
I have enabled "Workspaces" because I found that windows would hide on workspaces I could not access without this enabled. 

The windows ALWAYS migrate to the workspace to the left of the active one.
This issue only occurs with dual monitors with extended display.

I am now experimenting with disabling monitor power saving (Screens
should never black out). I will also experiment with using only the
external monitor.

Hardware in use: Dell XPS 15 9530 (the UltraHD touch screen model - it
is awesome). Monitor: Kogan Ultra HD 28" display. HDMI cable. Monitor to
the right of the laptop display (in case that config matters in the
"Displays" configuration.)

I'll report back on the results of "no power off" and "external as only
display".

Again - this issue is new to 16.04 for me. 14.04, and 15.10 were rock
solid.

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https://bugs.launchpad.net/bugs/1295267

Title:
  Windows change Monitor/Desktop after screen lock

Status in Unity:
  Fix Released
Status in Unity 7.1 series:
  Fix Released
Status in compiz-plugins-main package in Ubuntu:
  Confirmed
Status in unity package in Ubuntu:
  Triaged

Bug description:
  I run a dual monitor configuration, with one portrait and one
  landscape.

  I nearly always have multiple applications open in multiple windows
  across both monitors and all virtual desktops.

  When I lock the screen and then unlock, my application windows will
  move from their original position.

  Sometimes they are in completely random positions;

  Other times they seem to get the monitors confused, and rather than
  being in the top half of the portrait monitor they are on the top half
  of the landscape monitor;

  Sometimes it is only a new desktop, but the monitor position is the
  same;

  Sometimes it is the same desktop, but on the other monitor.

  Description:	Ubuntu 13.10
  Release:	13.10

  What I expect to happen: When I unlock my computer, all the windows
  are in the same position on the same monitor and desktop as I left
  them.

  What actually happens: When I unlock my computer, some or all of the
  windows have been changed to a random position on a random monitor
  and/or desktop.

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