Hi guys. I brought a new Canon 70-200 lens a few days back without warranty. It was working fine when I brought it. Now when I switch on the camera, the focus motor keeps working continuously even when the shutter is not pressed. It allows me to take photos but no focus can be set as the focus motor is running all the time. When I try to go to live view mode, there is no display amd when I try to go to video mode, it gives an error message saying "ensure the lens is attached" and even that time the motor keeps running. I have tried going to manual mode amd also switched off the IS but nothing is working.