I followed what you said 2 years ago, and I placed Black hole on disp B.
So,the bang does occur much less than on Disp A ,but it occurs from time to time.
As I employ only "black hole "as my main long verb,I can say if it does occur on another long verb.
I can only say that the bang never does appear on short verbs.
As I need my H8000 everday, should it be not possible to send the chip,if it does exist? I have good teches over here!