Several times in the last few days where I have minimised Mir to go to my desktop the resolution has gone back to 800 - 600 so the icons are all massive and blurred, when I change it back it and gone to open the minimised Mir there is just a black screen as Mir comes up and the mouse is frozen. The whole laptop is then frozen and nothing apart from force it to turn off works.
So pets goodbye....

Any help please?

The laptop is not a year old yet so not as if ancient.