I was running along a suggested Round-trip course the other day, crossed an intersection (still following the course), and suddenly my watch started telling me to turn around... and kept telling me to turn around. Additionally, it was telling me I had many tenths of miles until my next turn and then would dramatically jump to tens of feet before telling me to turn around. I wound up just manually referencing the map to follow the course until I knew where I was.
Has anyone else experienced this?