2012 Lancer won't start
 

Hey guys, I'm bringing my 2012 Lancer GT into the dealer again with starting issues. Back around September my car would not start if I went more than 24 hours without driving. After fighting with the dealer they agreed to replace my battery. But now it's the same thing, but it has gotten worse, everyday it is dead. And 3 days ago I received the "Keyless Operation System Service Required" message. And yesterday the check engine light come on. Any ideas what this could be, just in case the dealer gives me a hard time again regarding warranty?

Thanks in advance!

What is the code from the CEL?