Suzuki Club UK

Hi everyone. I have a 2009 automatic Suzuki splash, just recently passed it's M.O.T. driving home today it suddenly lost power & steering went stiff, I managed to drift to the side of the road. I turned her off & she started again straight away & was able to drive home. Not sure If steering feels a little loose now or it's my imagination. My usb charger is always at about 14.30 ( it has a voltmeter on it ) when she lost power it went down to 11 but, then back up to normal when I started her again.
Any advice gratefully received, many thanks