Ok, I'll check that.
I don't think it is a failure of Laptimer, since it worked perfectly on my previous phone with the Glo.
Meanwhile I think it is the smart localization of Android, using other signals like Wifi to determine the position.

An example:

Missing GPS update for 4 seconds:

Hi, I encounter the same issues. I'm using a Garmin GLO2 external GPS receiver and has been accurate for years, still same car, same track. Now I swapped phones (Sony Xperia XZ2 Compact to Samsung S24) and now I miss trigger points (Start/Finish) and see in the GPS maps that I go outside of the trac...