S21 Ultra GPS Issues

[buzshultz]

When walking my S21 Ultra loses GPS signals. I had no issues with my 
S9 but the S21 just stops in the middle of walks (per Samsung Health). I have tried turning off optimization with no results. From the forum, GPS loss seems to be a  common problem.

[Jmak]

Do you have anything mGnetic near phone? They seem to interfere sometime.