Motorola
If you are using a Motorola device and you're experiencing issues such as missing data, or nothing being recorded at all, turning off battery optimization for Slopes should get things working as expected.
- Open the Settings app on your phone
- Go to Battery → Tap on the menu in the top right
- Tap on Battery Optimization
- Tap on Not Optimized → All Apps
- Tap on Slopes → Don't Optimize