Hello , i have connected Tata Sky to samsung lcd tv.The problem is sometimes the display continously changes from b/w to color and vice versa. this happens for abt a min , then stops. When this problem comes on channel A , when u change to channel B, it stops chaging colors. This occurs at frequent intervals in all channels. Please help as to wat i should do.Customer Care are not very helpful as once when they sent engineer there was no problem during the time he came.