2016 Buick LACROSSE,58,000 automatic: Instrument Cluster gets really bright and dark, gauges, tack, gas, battery, temp, goes up and down. All warning systems, air pressure, battery, traction control etc lights go on and off, some stay on. Dashboard stays lite long after car shuts off.  Car stays running a few seconds after shutting down. At first, I thought it was only when it got wet, but it happens all the time now.  

I work only 8 miles from work, I don't drive much, and car is otherwise in a garage, not sure if that will help. Someone said to disconnect the battery to reboot.  Car's going in the shop on Fri. 17th June...any advice will be welcome. I'm a woman and they will see me coming.