Make sure the outlet you're plugged into has enough capacity to operate the AC and anything else running(like the 12V converter). The converter will draw 3 to 8Amps while the AC takes 16A to start and 13A to run. Verify your voltage is 120 or higher. The lower the voltage, the higher the current draw will be. If you are plugged into a 15 or 20Amp circuit, chances are you are simply overloading it. I can run my AC while plugged into a 20Amp circuit. But not much else. Chances are, when you tested it the first time, it was the only thing that was plugged into that circuit. Hopefully, this is good news for you.
