I'd like to go to the drive-in, but the radio keeps shutting off. I have keyless ignition, and I have tried all the usual suggestions to get the radio to continually play with the engine off, but it always shuts off after 5 to 10 minutes. I have turned off car in neutral and reverse, then put in park. No good. I have pushed the start button with foot off brake. No good. Pushed start button twice. No good. Three times. No good. Does anyone have a way to keep radio running??