I have GPSMAP 66i.
I am sharing with all of you two links of videos I recorded that explain what I think is a bad functioning (sorry because both are in spanish but I guess you will be able to understand the problem only seeing the steps through the menu)
https://photos.app.goo.gl/LairLuak519B5PXG8
So, I am in a never ending loop of something that I think is not correct and moreover Garmin is not being able to give an appropiate answer because even they don't know it or why it happens.
I would really appreciate If someone could try to check with your device if it has the same functioning as mine.