I have a Phantom V+ V3 with the vented wifi and 2.1 boards. Before the update When I first had a go of the Phantom it was picking up 12 sats without a problem but ever since I took the shell off to check what wifi module and boards I had I have only been getting 7-8 sats. I took the shell back off and done the connector mod to make sure it was secure. Still only getting 7-8 sats which I thought was weird. The Phantom was still flying great at that point and I was still flying in the same area. I then done the 3.12 update which failed the first time. I done a power cycle and tried again. It says on the screen that it was done and updated but the Phantom was still beeping. I done a power cycle and checked the update to make sure it had been done and then done a basic IMU calibration and RC stick calibration. Took the phantom to a field where I had calibrated the compass before. The first try to calibrate I got a green flash and then a red flash so I tried a 2nd and then 3rd time. All seem ok the 3rd time so I took off to do the hover test. The Phantom started going around in a around a 10 meter circle on its own. I landed it right away and tried the compass again. I got the red light again for the first few times but seemed ok on the 3rd. I took off again for the hover test and it seems fine so I went up to around 300 feet where it seemed fine at first but then went a bit weird. You can see on the video it went from side to side its self and then started to move around the sky its self. I managed to bring it down slowly to land. Anyone any ideas of what's went wrong?