Air 75 Motor issues. Dshot esc failure?
Background:
I have an air 75 and i flew great until one of the motors stopped spinning randomly during an indoor flight. I was confused as it had happened while flying level and at about 30% throttle. I thought that one of the motor wires had come loose, so i re-soldered the motor with the issue but it still refused to rotate. I thought that that was odd, but i ordered a new replacement motor. I unsoldered the old motor and re-soldered the new motor to the fc. It worked again.
The next few flights went well until i had smashed the frame and transferred the electronics to a new frame. When i first tested it, one motor was just vibrating like the other one that i had already replaced. I checked that all of the wires were not damaged and that there were no shorted connections. It started working again. Then at the start of this flight, the same issue occurred, so i rebooted the drone and it went away. But then it happened mid flight. (Shown in the video)
I recovered the drone and all motors but one were working upon arming the drone. I rebooted the drone once again but now, upon arming, no motors spin. The OSD just shows the 'DSHOT_TELEM' error. I have rebooted the FC multiple times with no sucess. I haven't yet connected the drone to betaflight as i just wanna know what should be done next.
The video goes frame by frame to see if anyone catches anything i havent.
Could it be to do with crappy soldering joints as i used a cheap iron?
Is it an ESC issue?
Is it a loose signal wire from the motor?