Kegging issue

I don't know what I'm doing wrong here guys. I get my nice fresh brew all ready in the keg and then over the next 12 hours, it begins to leak out from the connector that connects the keg to the draft tube. My set-up. Pinlock keg 5 gal keg. 6 foot draft tube w/ nozzle. 2 feet from regulator to keg. regulator set to 12 PSI. New O-rings. Fresh keg lube to o-rings. Is this a problem? Is there something wrong with the keg? Does something need to be replaced? Help greatly appreciated.

Have you cleaned and lubed the dip tube o-rings? Are the posts tight on the keg?

Do you have a barbed connection or threaded? If it's threaded, put some teflon tape on the threads.