I've had this set now for a few weeks and am generally v happy with it. However, when watching football/rugby/ other sport with lots of green background there is a noticeable dark vertical band on either side of the screen. Has anyone else had this problem with this TV ? If so is it something that an engineer can fix, or should I ask for a replacement/refund - the tv was bought from HoF but I know that its a discontinued model. Any advice would be appreciated.