I have an RV trailer with single LiFePO4 battery, solar charger and AC input. BMV-712 works fine most of the time and reports sensible numbers. Occasionally though it enters some bad state when it reports approx +17A current (as if the battery is charging). Voltage readings are still good. The only way to get it back in good state is disconnect the power. Current reading fluctuates as the actual load changes. It seems the readings are shifted up ~17A or so.
I saw the same problem earlier when I had an AGM battery and a bit different wiring. All the cables are connected to large nuts of the shunt. The battery alone to one side, all consumers to the other.
I suspect it breaks down when there is a good charging current. Last time it did that when I left my RV with solar panels plugged in. (I use MPPT 75/15 controller.) Not sure how and when exactly it happened, I found it in 17A state when I returned. The other time I plugged the AC power, the battery started charging at about 30A, that gradually went down to 17A and I figured it is stuck. On the other hand, most of the time AC charging goes without a problem. Last time it even started charging at over 50A and BMV worked fine.