Xbox 360 Hdmi wireless internet interference?

When i plug in my HDMI cable in my xbox 360 slim to my tv it doesnt let me connect to xbox live or it disconnects me after a couple of minutes , is this possible? because when i plug in my AV cable it works perfectly with no problems or disconnections? what do i have to do to get my HDMI to run properly? and what could be the problem here? please give answers thanks!