Hello, it's impossible to know anything about this without having more specific information and more importantly - a hands on assessment as to why it's not staying on.
Seek guidance at a local body shop or repair facility near you.
https://repairpal.com/repair-shops/lincoln-repair-and-service-in-columbus-ohio
RepairPal Certified shops can diagnose and repair your 2011 Lincoln MKZ. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.