Description:This can be related to battery saver on some systems, or the energy+saving apps disable background tasks from third+party widgets. Please try to check the settings, for example in Xiaomi phones "Security> Autostart", in Samsung "Maintenance> Battery".
Required Android Versions: Ice Cream Sandwich [4.0.3–4.0.4] - Jelly Bean [4.1–4.3.1] - KitKat [4.4–4.4.4] - Lollipop [5.0–5.0.2] - Marshmallow [6.0 - 6.0.1] - Nougat [7.0 – 7.1.1] - Oreo [8.0-8.1]