Decided to rebuild my 450 sypder as the previous frame was a bit old and needed replacement. Went to the field with the intention of flying. So I decided to do a Mag cal and during the process I lost connection to see that My UBEC was smoking and getting hot.
This is a ubc i have been suing for at least 30 flights. I am lucky as the issue happened on thr gournd and not while I was flying.