I have been flying my phantom 3 professional for about a month now. Every time I fly I try to go further but it will tell me "weak transmission signal" and the camera feed will cut out. This occurs after only about a few blocks away so less than 500 feet. I am at about 17-18 satellites whenever I fly and calibrate before each flight but it will still not go even close to the range of 1.2 miles as advertised. Any thoughts or ideas?