There is something very odd happening to my ipod touch 1st gen. When i put it on a table or any kind of surface I can pinch to zoom a photo, but it stops responding well to my fingers soon, so i have to put my fingers off the screen and put it on again. But this ONLY happens if nothing is connected to the iPod. if I connect the earphones this weird thing stops happening and I can pinch very well!
If I'm holding it with my hands, nothing weird happens...

Maybe this happens because a bad quality screen protector I'm using on it...

Can you tell me guys, if this thing happens with your iPods? with or without a screen protector?

Thanks in advance.