Quick connects rely on an o-ring seal. O-rings are generally off the shelf, super cheap parts...like 3 cents cheap. Turn off your water. Disconnect...and take a look.
I'd take the o-ring off and clean both mating surfaces and add a dap of vasoline. See what that gets you.
Try replacing the o-ring if that doesn't work. There isn't much going on there. and have a nice day with your kitchen faucet