My Xiaoxiang App for the overkill smart bms crashing when the current goes negative.. tried to do a battery test, and disconnected the panels, connected a load , then the Xiaoxiang App shut down. Strange.. when i try to reconnect, it start in a second, then shut down. If i stop the discharge, the app start as normal.. when iconnect the panels back, it shows the positive currint in to the battery.. what is happening?