thunderbolt display output distorted
Working on MBP 2.4 Ghz, i5, 8GB
OSX 10.9.4
When connecting via DisplayPort-cable to my Thunderbolt port towards a external TV (Philips 40") I see a nice mirrored image(see image 2).
However, after some time (random) I receive a distorted image on my mirrored TV (see image 1).
After disconnecting the cable and connecting it again, it restores the mirrored image back to the correct version. After a certain time (random) it swapped back to the distorted image..
Any suggestions?, tried reset of PRAM, ... nothing seemed to work.
Many thanks !