My A3 1.6 TDI surprised me tonight but telling me my service is due in 182 days or 1400 miles. The problem is, it had a major service on 8 November 2017 and I've only covered 8,000 miles (or 9400 miles by the time it becomes due). Over the last 5 years I've had it serviced pretty every 14-16 months doing between 15-20k. Bit confused what might have triggered the alert. Any thoughts?