So, I purchased my DJI Phantom 3 Advanced September 28th, it flew WONDERFULLY for the first 2 weeks, until this week i have started to notice some issues. Basically, the first thing i noticed about a week ago is when doing full speed or mid speed descents the phantom 3 wobbles moderately, looking like it may go down, i do very low speed or descents slightly to the right rear or from or right now to avoid this. Additionally, starting a few days ago i noticed while flying i have my phantom full speed forward, while moving forward it moves also to the left or right (whichever way it feels like crookedly flying that day), it has started to get worst starting yesterday as now while flying straight (stick only directly forward) or was also going 90 degrees to the right! I am sure this is not normal, as i searched the forums and no other issues like it! Additionally today, I noticed a new issue, while moving forward from a takeoff & moving up, about 600 feet out i got a error on the screen & could see the phantom rapidly rocking side to side & back to back, seemingly about to crash! The error read GPS Error, please exit GPS mode, luckily i quickly switched to ATTI mode & came in for a safe landing! I thought it was a fluke, so i powered down & tried again with the same occurrence. Keep in mind i did all proper calibrations & the right way previous to flight, NO metal objects around. Please keep in mind, i take great care of my P3A & NO crashed to date, only a few flights! The advice i am seeking, is that i purchased my P3A from Amazon, amazon was the shipper & a authorized seller was the seller, i have a 30 day return policy that i am still within, my P3A is the one with the new motors, body, & board, if i return & file for a replacement, what are my chances of getting another newer model & what are the chances of getting a old one? If i order from the same seller, are my chances good of getting a newer model? Also, should i just file for a replacement thru amazon & get a new one if wanted within a few days, or send this same one to DJI for evaluation & repair? Any advice/HELP is much appreciated!