[Canon reeves]

I do believe we located 1/2 of the problem. I did the tests with the multimeter and it was fine, I then turned on the robot and began checking the converter for the radio, when I did I heard this high pitched whining noise, and I noticed this happened when I tugged on the Wago for the converter on the PD board. I could cause the entire robot to briefly shut off by slightly tugging on the connector. When I checked the connector it was charred black around the wire, and when I pulled the wire out it was as if all of the individual strands had been saughtered together. I replaced the wago and pulled on it and it didn't shut off. We then tried to run the robot, but got no communication or code, but it did when we tethered it to the clamshell. I then drove back and forth and when I went forward then jerked back the entire robot shut off, the main breaker had been tripped. I pushed the red button on it then tried to turn it back on and it wouldn't turn on then I had to leave. It did this as well yesterday, and ever since then we hadn't gotten any communication or code unless we are tethered? Any probable causes?