Sound like a battery issue, I had the same problem last Oct, the battery died on me after 7 months, it's like hassle, they replaced it, after I got stranged on the road two days after dealer recharged the battery, and they thought it only need charge. I hope you won't get into the same problem like I did, but just be prepare, get yourself some kinda jump starter or cable carry along, I know it's sound kinda funny when you have to carry with the new truck, just so you won't get stuck out there some places, and that even a pain on the butt. I had enought of this 5hit, drove me nut for the whole week, and wasted alot of time/gas driving to the dealer. I told the dealer I didn't appreaciated all this happended to me, when their stupid batter tester told them it's still good, but turned out it got a bad cell, cause me stuck on the road, Since it's still under warranty, or else I would a good darn battery. If you ever run into this same thing, and they will not replace it on the 1st visit, you can kill the battery yourself, by given it four crank in one shoot, but don't let the engine turn over, this will kill it instantly when it got the same symtom like this, I learned this from a cousin mechanic, he used to work for Nissan, Toyo, Mercede and now Lexus, he said an experienced mechanic should took this route to get the battery replace for the customer when the battery had a problem less than a year, since the test shown it still good, but it can be death at later time with bad cells, so he has a reason to replace it. This will avoid the customer from getting stranged out there. Well goodluck, hope you get it resolve soon.
TT,