Is there a safety issue with the Ford Edge? If so, what can I do about it?

I purchased my 2013 Ford Edge AWD on 12/04/2015. I began having
issues with sensors popping up, displaying Collision Warnings and advance
track sensor warnings were off. I took it into the dealership and eventually it
was "supposedly" taken care of! On yesterday, I picked it up from the
dealership again, and shortly after arriving home, the Accessory Power is
Active warning came on. After reading other complaints about this issue, I
am greatly concerned about the safety of this vehicle. Other owners
complain of engine shutting off without warning. However, I have not
experienced that as of yet, nor do I ever want to! I don't know what to do
about this. I am starting to regret buying this car!