Welcome to the forum.
Peeling (or delaminating) vinyl wrap on MDF cabinet doors is a common problem throughout the RV industry. It may only happen in 1 of 100 trailers, but if it happens to yours, that's always "one too many"....
Currently there are two open threads discussing this issue. You can read about those owner's experiences here:
https://www.keystoneforums.com/forum...ad.php?t=55962
https://www.keystoneforums.com/forum...ad.php?t=56131
There are other threads discussing similar problems, just use the search feature to find more reading if you want.
It sounds like your dealership "fixed" (for lack of a better term) your peeling doors rather than replace them. You might want to talk to your dealership, show them what Keystone did for other owners and see if they agree that replacement cabinet doors would be a better fix for your trailer. Apparently, once the adhesive fails, it's not going to suddenly "stick with a second coat of adhesive"... So, starting with new doors is probably the only "real fix" for the problem.
Just a word of caution: If you threaten Keystone with a "Lawyer up" comment, you'll very likely find that their parent company, THOR RV Industries, sends you a letter from their legal department instructing you and your lawyer to stop corresponding with your dealership and with Keystone and that ALL future correspondence be directed to the "corporate legal team".... Once you make that threat, almost always, from that point on, your trailer will "sit in limbo until the court makes a final ruling on who is liable"....
So, threatening Keystone is an "excellent way to have your trailer sit with no repairs" until after the court case is finalized.
I'd recommend you rethink making those comments until you've exhausted all other means of getting your trailer repaired.
Of course, you're absolutely free to choose your own "best course of action"...