Meizu is probably on par with Huawei and Xiaomi in their approach to background process limitations, but they get a better rank probably just because those devices are not that common on the market, and thus do not cause such pain to the developers as the aforementioned.
Solution for users
Adjust your settings:
- Device Settings > Advanced Settings > Battery manager > Power plan set to Performance
- Device Settings > Advanced Settings > Battery Manager > Protected apps – check your app as Protected
- Enable Device Settings > Apps > Your app > Battery > Power-intensive prompt and Keep running after screen off