There is no lifetime warranty on this component, but if you replace the unit with a new one from Jeep, then that part will most likely outlast the car, and that is why I said you will not need to worry about it again.
Jeep does have a number of problems with these taillamp assemblies, but if you just replaced it with a new one from Jeep, mopar offers a 12 month warranty on their parts I beleive, so if you take it back to them they should warranty it for you.
Unfortunately, this is just one of the problems with these Jeeps.
I hope this helps! Let me know if you have any more questions!
There is no fix that would not fail almost immediately, sometimes you can bend the tabs on the bulb sockets and twist them in the taillamp assembly, but it is not a relaible fix.
Unfortunately, replacement is th only option.