My 2012 Challenger key fob acts up once in a while also. Mine pops my trunk as I slide my hand under the door handle as the car unlocks. I close the trunk and it will pop right open again. I smack the fob a few times and it may go away for a day or more or sometimes weeks, but comes back eventually. I think at times the fob get compressed in my pockets which is somehow keeping the trunk button pushed slightly.