Graphic glitches MBP retina Late 2012 (HDMI/games)

Hi To everyone!!! First of all, I am new user so I would like to salute all members of the forum. I am looking forward to be part of this community!!
I am new here so I will try to be as clear as I possibly can. My apologies if I not very good explaining these problems. I have experience two issues lately with my graphic cards. I think that they are becoming more often.
First, when I connect my MBP retina to the TV using the HDMI cable to watch something, the connection is lost briefly (1-2 sec), the TV goes black and then it reconnects again by itself. The TV shows the resolution  (samsung TV) and everything goes back to normal. This happens after 3-7min after I connected the MBP. I have tried disabling the sleep mode of the computer (I thought the computer could be trying to suspend itself) but it didn't fix it. Any ideas of what may be causing this????
Second, when I open a game or when I connect to the TV the screen goes off!!! What I mean is that the display shows "static" (I mean like when the analog TVs use to show a black and white fuzz when no signal was detected.) Sometimes it fixes itself and sometimes I need to reboot. Any ideas?????
Thank you very much!!!
Best wishes,
Tony

Hi TonyGol,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
Click on the link to see more details and screenshots. 
About Mini DisplayPort to HDMI adapters
http://support.apple.com/kb/ht4241?viewlocale=sv_se
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Cheers,
Judy

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    Report generated 13 December 2014 at 9:03:00 AM GMT+7
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      Mac mini (Late 2012) (Verified)
      Mac mini - model: Macmini6,1
      1 2.5 GHz Intel Core i5 CPU: 2-core
      16 GB RAM Upgradeable
      BANK 0/DIMM0
      8 GB DDR3 1600 MHz ok
      BANK 1/DIMM0
      8 GB DDR3 1600 MHz ok
      Bluetooth: Good - Handoff/Airdrop2 supported
      Wireless:  en1: 802.11 a/b/g/n
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      Intel HD Graphics 4000 -
      DELL S2440L - forced RGB mode (EDID override) 1920 x 1080 @ 60 Hz
    System Software: ℹ️
      OS X 10.10.1 (14B25) - Uptime: 0:53:11
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      APPLE HDD HTS545050A7E362 disk0 : (500,11 GB)
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      EFI (disk0s1) <not mounted> : 210 MB
      Macintosh HD (disk0s2) / : 249.62 GB (150.23 GB free)
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      Macintosh HD 2 (disk0s4) /Volumes/Macintosh HD 2 : 249.49 GB (172.23 GB free)
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