Ok, so its definitely the BBC ... btw,, you may be missing some HD channels when the BBC is disconnected.The coax at the receiver end was not hot. It didn't get hot until the body of the converter. The output connector from the converter felt much hotter than the body, but I was unable to measure the small surface with my infrared thermometer.
Just change the BBC, your making a lot more out of this than needs to be.Thanks for all of the comments and suggestions. After work today, I'll measure the voltage on both ports. If they are the same, I'll hook up a different converter. If port 2 is putting out more voltage than port 1, I'll call Directv.
It doesn't hurt to rule out the receiver putting out too much voltage while waiting for new B-Band converters. It's not over thinking(although to be sure,I don't know what acceptable output for a receiver is),at he'll know it's not the receiver's fault & be paranoid that it could happen again.Just change the BBC, your making a lot more out of this than needs to be.