I have had a Zenithink 180 tablet with Android 2.2 for several months. I use it alot for watching videos. Recently when I plugged the headphones in there was still sound coming from the speakers as well.THis had never happened before but now seems to happen all the time and the headphones are working fine. I have unplugged them, replugged them, checked the connections, tested the headphones in a different device, tried it with different headphones and still the same. Has anyone any idea how to fix this???? It is driving me (and my partner) nuts!!