Thunderbolt signal keep falling out!?

Hello i have problem with the thunderbolt signal keeping falling out.

The problem occurs when i connect my MBA to a projecter or my tv, with an thunderbolt-vga adaptor or thundebolt-hdmi adaptor.

In around 70% of the time the signal is good and display video and sound (when using Hdmi), but 30% of the time the signal drops/falls out and there is either no connection or only sound.

Is the port falty or could it be something else?

Hope you can help me.

Mathias Brix

Ps. If needed i can post a video of the fallout