I am afraid that that I am not having much success. I updated my graphics card and deleted a log me in mirror which was also listed as a graphics card.
I though this had sorted my issue and indeed it had until Saturday.
I think it has to do with how many markets you are running. During the week I may have 10-15 max and it is fine.
On a Saturday it could be 40 so I will try version 8 and see if it is any better.