If your rig is 2012 then I assume that the converter is out of warranty. Therefore, if you have it dismounted from your rig, you should be able to open it up and visually inspect it (if you open a new one yourself, you'll void the warranty). You should check to see if it has "burned out a trace", which would literally be visible as a burned path across the circuit board. This type of event can result in a number of immediate and longer-term effects, which could potentially culminate in a fire, depending on what happened and how it's progressing.
We had an almost-new 3-stage Parallax converter fail on us. We are very lucky that it didn't set our rig on fire. Parallax admitted fault and replaced it under warranty, but by that point we were thinking, "We Are Done
with this consumer-grade crap" and my husband (an engineer) proceeded to develop our own lithium system which has worked flawlessly since being installed (knock wood).
You can read about our converter failure in this thread
if you are interested in seeing if trace burn might be your issue. This other thread
is lengthy but it talks about why circuit boards sometimes burn out in the first place. It does so within the context of refrigerator failures, but the principles are the same.