My Mac Mini is dropping pixels

I have a 2010 Mac mini That I use for my media centre. It's hooked up via HDMI to a 42" LCD TV and is running the latest version of Mavericks.
The problem is about once a week, I need to restart it because some pixels mostly tool bar and the Dock ones go black.
Is there a fix for this or might it be the Graphics card is dying a slow death?

I have not tried logging out then back in but instead restart it. This seems to fixes it, but it reoccurs a week or less later and a restart is required to fix it for another week or so.
I am now wondering if it is an issue in Mavericks itself since I've had this Mini since Snow Leopard and Mountain Lion it never did this till Mavericks.
I use it daily and let it sleep over night, rebooting it every 2 weeks or so but now, I reboot it every Saturday (weekly).

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Hi Leo, this has worked for a few...
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http://support.apple.com/kb/HT2712
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Hey all,
Long time listener, first time caller.
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</Mark>
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Hi John,
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Hi
I have a brand new mac mini w/ mac Os 10.5.2. I connect to the internet via ethernet: it works fine for some time (30 mins, 2 hours) then, apparently for no special reason, it drops the connection and I need to reboot to restore it. It is connected to a switch hub with other devices (macBook, AppleTv) that continue to work fine, so it is not an ISP issue. After rebooting the problem occurs with higher frequency, i.e. connection lasts for shorter and shorter periods then reboot is needed every other 5 mins.
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Hi Keith
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My Mac Mini is dropping pixels

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