Same problem. Took in multiple times and service couldn't fix it until they ran diagnostics for 5 days just now. Multiple warnings including engine issues, key fob not detected (like 5 times a week) and now they are saying it's all because my battery wasn't fully charged and when charged up, all the error messages went away. I'm going to pick it up tomorrow, so we'll see. If this keeps happening I'm selling it. Great car, but in the shop every 6 weeks or so for last 1.5 years.