Do you want them all to auto-minimize? You can probably get that. But it starts with answering the question.
On a laptop, reconfiguring to use monitors as and when you connect/disconnect them can be great.
However, I'm often on a PC with a fixed multi-monitor setup. The situation where one monitor is briefly out is transient. But some windowing systems decide to permanently erase all your painfully eked out settings at the drop of a hat.
The correct behavior in this particular case is actually just to do nothing, the fact that a monitor seems to have gone away should just be ignored. (Because it didn't go away, really. Maybe I'm just messing with it for a sec, or it's a different brand and turns on/off a few seconds after the others)
[IIRC on KDE you can prevent auto-reconfiguration by turning Kscreen OFF ]
That's why I run fluxbox window manager on a non-ubuntu linux distibution.
Leave windoze, leave ubuntu, regain control of your computer...