I went to watch a movie in 3D tonight and the effect wasn't working. I thought the glasses must need charging with USB. I did that, still not working. The light flashes green to show they are charged and ready to work. I tried charging it again and noticed 3D for around 3-4 seconds before it stopped working again. Has anyone got any idea what this is? The TV is a HX-82355 The glasses are USB rechargeable active.