Found Fenix 5 Plus 'updated to 17.10' this morning. Since then, widgets such as Hunt & Fish that use the last known location, try to start GPS, probably because a cached position is not available anymore. When indoors, "Waiting for GPS-signal" is shown. Earlier that and other widgets worked perfectly fine indoors, now only outdoors and within 30 minutes of having had a GPS fix.
The exact same also happened to my Fenix 6 Pro after updating to version 20.00; beta team could not reproduce it, full resets and installing previous version didn't work for that,
[Update] ..on the 6 Pro, it spontaneously started working again, two days after installing an earlier beta, but broke again after 24 hours. On the Fenix 5 Plus, it's still broken.