When moving during Run activity my Forerunner 255 (19.18) alerts (rings/flashes/vibrates continuously) displaying the number 26687.7 with a small triangle (road symbol?) above it.
This alerting only stops when I stop moving or change activity, e.g Multisport switch to Walk was fine, then switch back to Run and alerting resumes.
The Up/Down buttons are ineffective during the activity alerting, but everything records okay during the activity that I can see.
I have tried powering off/on, deleting/adding the Run activity, removing any IQ fields...issue remains - anyone have ideas what my cause/fix this?