Apparently, this happens more than I knew. I googled it. Freaky thing, could go off at any time. Will not be able to get to the dealer until next week.... Oh well, will keep key fob close in case. Need to disarm it again.
2017 X4 28i
2016 Mustang GT
2014 X3 28i - sold, 2013 X1 x28i - sold
2006 Mustang GT Vert - sold