Apologies for the epic post length. Last week I was flying at the beach filming some shacks when the wind picked up and became much stronger through the flight.This depleted the battery faster than I was expecting. When the 5 minute alarm went off I had already turned for home but the Phantom started to lose altitude fast,dropped behind a sand dune and the signal was lost,TX and FPV together. It took me about 12 minutes to find it and all that time,or most of it,the Phantom kept running.As far as I can tell it went into failsafe mode shortly after touchdown.The front props where dug into the sand and the rear motors were spinning for nearly 10 minutes,the Arris gimbal was having spasms all the time as well until the battery died just before I spotted the Phantom. I had not flown again until today and the first flight ended in a sudden forced landing no more than four minutes into the flight. When I found it all was well,motors off,no damage. I changed the battery and went up again and at about 4 minutes the Phantom started losing altitude as I was heading sort of back towards me but it dropped bellow the horizon behind some low trees and behind a drop off in the hill and landed/crashed into long grass and flipped upside down.When I found the Phantom (5 minutes later) this time the motors were still running,or trying to. Two were trimming grass,one was tangled in grass and one was tangled in the FPV antenna.When I picked it up and removed the obstructions all motors were spinning. When I put another battery in the Arris gimbal went berzerk and would not settle so I shut it off. After that I went home and connected to Naza (eventually,another story) and checked all the settings and all looked ok.I removed the gimbal and tried another flight,only three minutes to self landing. I had altered the battery voltage settings when I installed the gimbal to get more flight time with the gimbal and FPV running on the main battery and it has been flying well and I've been getting 5:30 to 6:30 each flight after settling on a compromise between not enough air time and too hot batteries. So I am perplexed as to why the flight times even with the gimbal removed and FPV switched off I was only getting three minutes. I reset the voltage settings to the defaults,the same as the stock Phantom,and still only got 4 minutes to self landing. I have read that if something like these incidents happens it can damage the ESC's,is that correct? Could this be the reason the flight times have suddenly dropped? Is there anything else that could have been damaged by this in a way that will cause faster battery drain? I have tested the batteries in my stock Phantom and I get 9 to 10 minutes flight time easy.