AV cable - problem

Is any of you guys had a connection problem with AV cable ?? Today I had red ring of light , but there was no flashing...

I read in the Xbox manual that is some problem with AV cable ... After the cable checking the 360 worked properly, but now I am a little bit scared !!

I mean,how this problem can happen if console always standing in the same place without connection and reconnection after the playing it ??