GPS enabled but no speed or distance measurement

Hi,

I have an user which complains that my Rowing application does not record the speed and the distance on a FR55 only.

The code was unchanged since a while and nobody reports such issues on other watches. Also I could check that the GPS was enabled in the log and the quality was good.  But completely odd: no information about speed and distance are stored. It is as if the GPS was not activated.

Did anybody have a similar issue?