2005 Chevy avalanche 1500 died while driving and won’t start now

I was driving down the road and all of a sudden my truck just died when I tried restarting it it wouldn’t even crank over remind you the battery is new so I know it’s not thAt all lights are still bright so got it towed home and when I took the key out the dash lights would not go off we had to disconnect the battery the next morning we connected the battery it started right up ran then shut off Then it starts and then dies we tried switching all the relays starter is good alternator battery is good nobody knows what’s wrong they belive it could be the ignition failing to communicate with the cluster so it shuts the trucks off any ideas