I have a brand new P3S. The best range I've been able to get is about 500 feet. Is this normal? DJI says it should be out about 1/2 kilometer (about 1550 feet) and I've seen Youtube videos with standard ranges of upwards of 4000 feet (without range extenders). What am I doing wrong? I've lost signal and had a RTH twice at ranges of about 550 feet. Thank you for your insight.