Reducing vibration at the flight controller is the number one requirement for every one made.There are stipulated safe limits in the wiki of +/- 3 for the X/Y axes and -5/-15 for the Z axis.Safe maximums.The result of having big vibes is a reboot/freeze/confusion/erros in the flight controller and the result of that is usually a crash.Which is why we spend so much time getting the vibes as low as possible.So have another look at your graph bearing those wiki figures in mind and wonder how it managed to stay in the air for quite so long.
The power supply to the flight controller is required to be 4.1V to 5.7V with a variation of less than 0.3v and preferably less than 0.15v.Yours dropped to 4.2v with a variation of 0.59v.The result of a voltage drop to the flight controller can be remarkably similar to the result of excessive vibration.Flight controller confusion or reboot leading to a brownout and a very sudden and undignified end to that flight.As the log ends abruptly at alitude,and your VCC (power feed) is dodgy,there’s a great chance this was a brownout which would appear to be a throttle cut on the ground as the flight controller shuts down.
Worth doing a lot of reading of the wiki for this sort of stuff.That copter was doomed.Time for a new frame and a Pixhawk.
Which flight controller are you using by the way ? No mention of specs but I’m thinking an APM 2.xsomething using 3.2.1 firmware…