2 spontaneous reboots during a long gravel ride. The 1040 picked up the course again both times and the mileage, etc. continued to count. However, there is a 85km gap in the data in Garmin Connect between the 2 spontaneous reboots, and a straight line has been drawn on the map between the points where the spontaneous reboots occurred which has resulted in a 85km loop in the route being lost.
Something similar happened to me earlier on a long (200 km+) ride with 27.12 beta sw. Now, under 27.14 stable, it happened just during my 333km record gravel ride, leaving me with a worthless data set and an equally worthless route map to remember this by.
Very disappointing that my €500 Garmin has let me down again!