A couple times I have had the fob not being picked up by the truck Both fobs the same, and I changed the battery in mine, did not help, but the truck would start when you got in and pushed the button with the fob.
BTW ,I am still running my factory battery in my 2014 Ram, but it does sit in the garage, but I don't use a battery minder, But Should put one on the wife's CRV as that little crap battery will go dead, low in a couple weeks sitting . Weather bad, she will not drive it 2008 , 80,km.
BTW that battery is almost new, old one was the same. Too small.
Getting off topic a bit , remember the stories about scumbags stealing these, I bought a couple of those little pouch for the fob , and it does work great. Wisdompro I think, 2 for20.oo