Swim Activity - Cannot exit

Upon completing swim activity ... Pool laps (10) ... the activity cannot be stopped/saved!

The activity simply continues on adding intervals no matter which button is pressed.

Only way out is to press and hold the red cross button when presented ... deleting the activity entirely!!

Vivoactive 4 - SW Version 3.6

PS: This is my first post and i get presented with "Your posting frequency has exceeded allowed rates ... etc:" ?????