IKon Governor disengages

Unwanted motor cutoffs were known to be caused by older versions of Spektrum firmware in the SPM4651T receivers later resolved by Spektrum with their latest firmware release.
The problem also occurred in configurations where redundant DSMX satellites were used.
Are you sure that all your SPM4651T receivers are updated to the latest firmware released by Spektrum?

Another possible cause is the temporary or prolonged loss of a valid radio channel signal (Fail Safe).
In this case for safety reasons the Throttle signal is brought to zero to prevent the blades from having thrust power during any impact caused by loss of control of the model.

The causes in this case can be many.
For example, strong electrostatic discharges generated by the drive belt if the tail mechanics are electrically isolated from the main frame mechanics.
Signal loss due to "dimming" of the signal received by the antennas if the antennas are hidden by the model's carbon frame, which is conductive and acts as a shield.
Signal coupling of the antennas or serial output signal of the receivers (crosstalk) due to excessive proximity to power cables (motor cables, ESC cables, battery cables).
Problems on the receiver power supply voltage.
Cables shorting against some edge of the carbon (conductive) chassis against which they have cut or stripped.
Etc. etc.
Again, though, without a Flight Log file it is impossible to analyze the power supply voltage trend and the radio signal frame rate trend.

PS: Without the configuration file, Flight Log file, Events file, we can't tell you more than that. We tried attaching a default configuration file and had no problems.
As a browser are you using Edge? Try using another browser (EG: Chrome or Firefox).

I am using Chrome. I cant get Edge or Firefox to work either.   The 'No more attachments are allowed today" still appears.

Upload files seem to work now. Please review attached.

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You didn't tell us if you checked all the things we wrote down for you.

We see that your flight controller was activated in 2019 and is therefore five years old but you have only done 71 flights with it for a total of two hours and six minutes.
The configuration file you sent us was probably saved with transmitter off and/or flight control unit not powered by the servo bus because in panel 5 we see that the three semaphores receiver, satellite1, satellite2 are all off (red) and the sliders instead of being in the prescribed position for servicing as explained in the message that appears during saving are all at zero.
If, on the other hand, the transmitter was on and the sticks in the required position, then it means you have serious problems in the transmitter and/or receiver.

In panel 12 of the Wizard where you configure the Throttle output signal going to the ESC we see that as the minimum output value you did not set the value suggested for Hobbywing ESCs (1100us) but left the default value 1000us. also the Out MAX is wrong (2200us instead of 1940us). In panel 1 of the Wizard it appears that you selected Hobbywing as the ESC and therefore either the values should have set automatically as a result of your selection but evidently you selected HobbyWing in panel 1 only after you had already started the configuration of the next panels without respecting the sequence of the panels and setup.

We also see that you have selected the Auto Level & Rescue checkboxes controlled by radio channel controlling the B-Aux1 function, but from the center position of the B-Aux1 slider (0%) in panel 5 the control appears to be in an unspecified position for the flight controller (it should be -100% = Off, +100% = On instead it is somewhere in between.

The Flight Log is very useful.
From the Servo Voltage curve, there are no problems in the supply voltage and in the Frame Rate curve there are also no problems in the radio signal reception and from the RxThrottle there is also no indication that a Throttle Cut has occurred from the transmitter and receiver.
However, abnormal behavior is present in the Throttle Out and RPM curves.
Around second 58.68 of flight, we see a sudden drop in RPM and a sudden increase in the Throttle signal sent from the Flight Control Unit to the ESC to try to compensate for the drop in RPM.

This behavior can indicate two types of problems:
The unidirectional main shaft started to slip causing the rotor to lose RPM, the motor pinion started to slip on motor shaft causing the rotor to lose RPM, the motor shaft started to slip in the motor case causing the motor to lose RPM.

Or:
The ESC reduced motor RPM despite receiving a 100% Throttle signal as a result of one of the possible protections:
Overtemperature,
Overcurrent
Battery Under Voltage.

In the latter case, recovering the model you should have heard the sequence of sound pulses and led flashes whose number indicates the type of protection that was activated by the ESC as explained in the HobbyWing instructions.

We see that you have activated the telemetry of your Platinum V4.
But unfortunately, only the Kontronik, YGE, Scorpion, OMP, ZTW, Platinum V5 ESCs generate specific Events as a result of the activation of possible protections or errors that are recorded in the Events of our flight controllers.

In contrast, the Platinum V4s with the current firmware do not generate these events.

However, we can tell you that it is well known and written by many users in the various international forums that Hobbywing ESCs very easily go into Low Voltage Protection and that all users knowing the problem disable this protection in Hobbywing ESCs

BrainDev: configuration file you sent us was probably saved with transmitter off and/or flight control unit not powered

Me:  This is correct unit was not connected to radio.

BrainDev: In panel 12 of the Wizard where you configure the Throttle output signal going to the ESC 

Me: I will correct this

BrainDev: The unidirectional main shaft started to slip causing the rotor to lose RPM, the motor pinion started to slip on motor shaft causing the rotor to lose RPM

Me: A little confusing.  I infer this to mean that the physical main shift is not connected to the motor and there is slippage?  If this is what you meant then no there is not slippage with the motor and the main shaft.

BrainDev: the motor shaft started to slip in the motor case causing the motor to lose RPM.

Me: I take this to mean the motor is slipping inside of the motor case?  I had the same issues with another motor.

BrainDev: In the latter case, recovering the model you should have heard the sequence of sound pulses and led flashes whose number indicates the type of protection that was activated by the ESC as explained in the HobbyWing instructions.

Me: I did not hear such tones.

BrainDev: Hobbywing ESCs very easily go into Low Voltage Protection and that all users knowing the problem disable this protection in Hobbywing ESCs

Me: I have changed this to disabled

My next steps:

I have ordered the cables to update the firmware on the SPM4651T.  It will take a couple days to receive.  I have disconnected one of the SPM9745 satellites.

Your analysis is very helpful.  Thank you for the expedite response.

This is the message that appears immediately after selecting "Save confoig to file ..." in the "File" menu:

Since we always ask users for the configuration file to attempt to diagnose the reported problems, it is obvious that saving the configuration file is done for "diagnostic" purposes.

As for the possibility that one of the other two possible ESC protections (Overtemperature, Overcurrent) in your ESC may have been activated in addition to the Undervoltage protection that you said you disabled (was it then active?), it would be helpful to know your flying style.
In fact, for a 700-class model a 120A ESC is the absolute minimum. If you are doing aerobatics or even 3D, a 120A may not be sufficient, and this would be another possible explanation for the shutdown of your 120A ESC.

It should be remembered, however, that even those who have been flying for a short time and therefore are not yet able to do stunts, especially because they are just starting out could easily lose control of the model and to try to recover they could ask the motor for as much power as possible to avoid a crash.

You stated in one of first responses “The problem also occurred in configurations where redundant DSMX satellites were used”

Question I had one SPM4651T and two SPM9745.  I removed one and now have one SPM4651T and one SPM9745, is this OK?

BrainDev: Are you sure that all your SPM4651T receivers are updated to the latest firmware released by Spektrum?

Me: I confirmed, the SPM4651T has the latest firmware installed.

 BrainDev: It would be helpful to know your flying style. In fact, for a 700-class model a 120A ESC is the absolute minimum.

Me: I am not doing any type of 3D.  Just barely hovering.