The specifications of the BMV 712 state that operational voltage is from 6.5 - 95V. Yet, at 10.5 V my BMV stops tracking. My batteries will shut down at 8v, and turn on again at 9.2V, according to specifications. The BVM's voltage indication matches within 0.2V of my battery voltage measured with a volt meter. Any ideas why the BMV stops functioning at 10.5V?