okay, so basically my new (second hand) phantom 3 advanced has been having a bunch of issues since i bought it, the most recent of which is it permanently saying "signal lost" on my phone (gs7). I have tried updating firmware and relinking the controller, neither of which had any success. This issues happens when the drone isnt in flight and no matter where my drone is. Before this issue, i experienced extremely choppy video streaming to the controller. I was wondering if this is a hardware issue ( i would then return it to the retailer) or is it a fixable software issue.