MBP strange flickering blocks of multi-coloured lines on screen

Hi
over the past few weeks when awaking from sleep my MBP 13" (mid-2012) has had this problem <a href="http://s1204.photobucket.com/user/sjwhite26/media/IMG_0035.jpg.html" target="_blank"><img src="http://i1204.photobucket.com/albums/bb404/sjwhite26/IMG_0035.jpg" border="0" alt=" photo IMG_0035.jpg"/></a> i.e. blocks of multi coloured lines flickering on the screen.
You can use the machine, but its incredibly annoying and and reboot gets rid of it.  My issue is that it is happening more and more.  I also have the issue when the MBP won't always wake from sleep when using the mini display port attached to my screen.  This is viewable on the laptop's native screen as well as the dell screen.
Any help would be appreciated.  I've tried all the PRAM etc resets.
Thanks

Let the battery full drain. After charging for at least an hour try again. Include thises suggestions as necessary.
iOS: Not responding or does not turn on
If still problem time for an appointment at the gensiu Bar of an Apple store.

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