Since about two weeks, my Garmin HR monitor (HRM dual) is acting wild. When my HR go up, my monitor is displaying big numbers. When doing endurance, I am usually between 120 and 130 and I see MY HR going to 160 at least and up to 200. When my HR go down, the value displayed go back to normal.
Battery is recent, strap too and is washed regularly.
It doesn’t bug everytime, I noticed it did when riding with my father who has the same monitor. And today it did while I was riding solo but I just added a cadence sensor.
It seems to be cause by interference with other devices.
Did you have the same issue, is there a solution ?
Thanks for your help !