@Olaf-Gottschalk Hmm - I am pretty close to your use level (24/7 an d10-15 hours a week recording. With an earlier device I would have issues near specific locations - not so much GPS issues, but total connectivity - I think folks in those areas had cell phone/RF blockers (illegal, but it was an interesting part of LA) and sometimes those are around LE or Mil installations. Do you issues crop up around the same geog area?
just a WAG from my own experiences.