works for 10 mins then engine stops writing "off" on screen, try to restart starter solenoid chaters in and out, when started electro magnet clutch will not come in screen says EU24 when trying leave for 10 mins come back works perfect, for another 10mins, battery new at 12.75 volts charging well, in fact mower on done 20 hours but no warranty bought from old stock. help what id EU24 error message