Two Days Ago: Was flying in a friend's sister's yard where I'm staying in Australia, just keeping it a few 10s m off the ground and getting some sunset pics. Went to bring it down and it darted off in a different direction. No idea what the indicator light was doing. Spent the last two days depressed, but after flyering this morning, was able to recover it. Based on the GoPro footage, it had a reasonably soft landing on a rooftop and was picked up by a dad with four children within 10 minutes. Problem: After checking out the GoPro and making sure that's working (ports/SD cover is missing, no biggie) and backing up the card after fixing it via Windows command-line, went to start up the quad to see if it would work. Battery that was in it probably went to too low of a voltage, it's not starting the quad and it's not charging. Used a spare battery. I get the "System start and self-check" series of RGYRGYRGYGGG, and then I get a rapid YYYYYYYYY... indicating "Tx signal lost." What I Tried: 1. Replacing the transmitter batteries. Twice. The second time was with Duracell that has the little level indicator on the side, so I can see they are, in fact, fully charged. 2. Hooking the Phantom up to the diagnostic software. It wouldn't let me do ANYTHING until I upgraded the firmware to 4.02. So, I did that. That's when a popup box said that there was a Tx issue that needed to be fixed. Duh ... that's why I connected it in the first place! 3. At that time, I saw that the red indicator LED on the receiver was lit. So I went through the linking the Tx/Rx steps. MANY times. Two potential issues at this point: a) I had maybe half a second from releasing the link button while the LED was blinking to when it went solid again to turn on the Tx with the throttle down. Is that normal? b) The LED did not go out after this step. Usually. 4. Following this, turning everything off, then on again, the red LED Rx indicator would be on briefly, then shut off, then turn on again after maybe 10 seconds. It would stay on for awhile, shut off for awhile, turn on for awhile ... etc. No idea on this. 5. Used the Advanced Guide section A5 and went through the Transmitter Calibration. Twice. Same issues as before: Yellow status light blinking rapidly if not connected to computer, computer saying that Tx wasn't calibrated or maybe a firmware issue, and red LED Tx light on the Phantom control board still was usually lit. Sometimes not. 6. Tried starting up the Tx with the switches up and throttle down, as per the DJI wiki. Note that I had always had the switches wherever I last left them and the throttle in the middle, as it is because of how the Phantom transmitter's springs are set. 7. Triple-checked that the firmware actually is up-to-date now. 8. Double-checked the connectors between the Rx and Naza. Still glued in on the board end, still solidly connected on the Naza end. Help? I've been working on this for a few hours while I have my friend's 5-year-old around me wanting to know when it'll be fixed and attempting to help me. Any ideas at this point? What have I not tried? If it matters, this is the Phantom v.1.1.1. And, it worked fine for probably 6ish flights before deciding it wanted to escape on Thursday.