Yes it was three days ago. I was on FW .700 and I was on version 14? I think of the GO4 app. It was on the tablet that my wife shares with me. She had left the wifi on and it automatically updated to version 18. I didn't know, tried using the tablet with the bird and got the locked message. So not even thinking about it I went ahead and did all the updates to the firmware on the bird and updated my phone to the version 18 of GO4 and then nothing worked worth a crap. I rolled back my GO4 app to as far back as I could using APK and it was better, but I started having random gimbal issues in flight. Bought Litchi on Sunday night while it was still on sale but I have not had anytime to test it yet to see what happens. I did try rolling back my FW using Dumldore but it doesn't work anymore. After you go through the whole process and it says updated, when you go check it is still on the newest FW version.
If you updated your FW to the latest (4.1000) then you are unable to downgrade.
You should set your tablet/phone to not update apps automatically.