I've beeb using Oruxmaps for years on samsung devices (thank you for your great work creating one of the best apps for gps tracking)
Now I bought a Honor 7x phone, and it looks like I'm having the same well known problems: it loses the gps signal as soon as the screen turns off, so the track is made by straight lines.
The phone, as I said, is a
Honor 7X
Model: BND-L21
Build: BND-L21C432B123
Android: 7.0
EMUI: 5.1
Thank you
J.