I bought a used 2015 SV crew cab in January of this year and let it set a week or so and it started, ran fine and then at my sons baseball practice I was on my phone with the engine off and the dash lights start flashing and several gauges start jumping. I check and no we are not in the on position and I complete removed the key to see the dash lights still going crazy and got video on phone and then is started and ran fine, no issues. I had to drive another vehicle for 3-4 days and didn't start the truck and got the flashing dashboard with the exception it threw an engine code, low transmission fluid. It was under warranty so I took it to the dealership and they put it on the computer, said the transmission was just hair low and took care of it and battery was low on volts but within acceptable norms. I showed them the video of the dash lights going crazy and they had nothing from their mechanics or in their database about such behavior. I drive it from January through spring, summer and into fall and this morning I drove it to work and my son borrowed it to take my daughter to drop off her vehicle in the shop for a nail in her tire. I go to lunch and to take my daughter to pick up her truck and when we approach my truck we hear the radio playing, except the keys are in my pocket. I unlock the door and the dash lights are on and off and the radio is playing. I put the key in and try and start and get nothing. I'm thinking low volts, probably battery at this point, it is 4 yrs. old. I turn key again and it turns over and it's not a slow grinding crank, it's got some oomph in it. Still wouldn't catch. I called maintaince for a jump and we try that, same result. Right now my dash lights are still on and off and ever few minutes you can hear a click-click-click down behind the battery. Any clues?