2012 Focus False Low Battery Warning
 

My Focus keeps throwing a false Low Battery Check Manual warning constantly. The radio is supposed to have a "1 Hour" mode in which it will run without the key on for one hour before automatically shutting off, but it will only run for 6-7 minutes. Then it won't come back on unless the car is started. I've had my battery checked and it's fine. The car starts effortlessly every time. I've checked computer codes and there is one, but it is not electrical in nature.
Has anyone seen this? Is it a known bug? Can it be resolved? It's a PITA. Thanks!