after about an hour of really checking everything out, the mechanic thinks it was just a bad connection on one of the battery cables...had to order some part that will keep the cable connected to the battery stem thingy better, the mechanic rigged a nail in it to tighten it up and he thinks it will do the trick of keeping that working until the new part comes in...they couldn't find anything wrong with the engine...keeping our fingers crossed! It's a 2016 Jeep Cherokee, but only has a little of 34,000 miles on it...one (well 2) owner, (me & my hubby) has ever driven it.