Took my 540 out on a ride today and luckily I knew the route but it was constantly every 5-10 minutes alerting my to "course found" at the bottom of the screen and "updating course" at the top.
This was a pain as it wouldn't show my data fields as this happened.
Quick thing to note, I wasn't deviating off the intended route. I planned it with Strava and synced it to my Garmin. I'd be on a long straight and randomly get "course found" for 10-20 seconds.
Saw another post as well mention they were getting the wrong directions with their route. It happened once today when it said to turn left instead of straight. Curious if this is part of the issue.
The unit is on the latest version of firmware. Will test it out again but not filling me with confidence that it's going to work as intended.