I am upgrading some very aging Canon VBC50i cameras which I bought 10 years ago. I plugged the cam up with an CAT6 cable and a 12v 5 amp adapter powering the unit. When it started I heard all kinds of weird noises coming from the cam. If it's anything like the old Canons I was expecting the PTZ to establish it's starting point. Well the PTZ never moved but sure sounded bad. Once I communicated with it all the functions of the camera appear to be working well but that noise persists. What could be going on with this unit?