Smoked 3 month old VESC - What did I do wrong?

As the Subject suggests, I appear to have smoked my VESC today. It is a VESC 6 from TRAMPA that I have been using to balance my custom onewheel build. I have just recently got to the point where I can actually move my motors and what not, but I have always been having the balance app go into 'fault' mode, which basically just disables outputs to the motors as far as I can tell. I haven't been able to get very good logging yet to figure out what my actual current draw is and what not, but based on some tests I did, I think for the majority of the time I run this, I am only drawing ~20-30 amps, but I have large current spikes that go above 100 amps.

As to what happened, Yesterday I added a 'fault dealy' to try to see if that was part of my issue. The onewheel worked a lot better and I was able to ride it maybe 50 yards continuously. After those 50 yards it was running way worse than before. I decided that was enough testing for the day and let it go to sleep in my trunk. Today when I tried to turn it on, it didn't. I tried to connect via USB, and it also wouldn't connect, and said I needed to make sure the vesc had power etc. I could visually see none of the LED's on the VESC on. At that point I tried disconnecting and reconnecting the battery. When I started to reconnect the battery there was a spark along my quick disconnect. My 60 amp automotive fuse didn't blow but I could smell some magic smoke(no visual smoke). At this point I checked the battery volage and it was in the middle of its range at 23V, and I disconnected the motors. I tried one more time to connect power, again sparks and I smelled a little more magic smoke smell(but no visual smoke). I took the VESC apart a bit and the smell is coming from the fett/shunt area. Has anyone seen this before? Is it likely to be fixed with just a resoldering? and what do I need to do to stop it from happening again?

I can provide some information on what currents/duty cycles I was using if you request specific numbers. I am very new to all this VESC stuff so I don't know what all the numbers mean yet.