I occasionally get gibberish data on my BMV-712 display, e.g. the attached pic showing a Mid point battery discrepancy of 43,039% with the alarm indicator (!) on. When this happens the display generally rapidly changes with garbage data. Unplugging and replugging the device seems to clear it up.
I haven't yet mounted the display unit properly, I'm guessing this is from a bad connection between the shunt and BMV, or could the unit be faulty?
https://photos.app.goo.gl/md92R7px8GGAdiki8