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go to settings>smart assistant>power save manager and turn it off, it's umidigi's custom battery saver that kills all apps , not only suspends them, outright kills the process wich sure saves the battery really well but also kills the functionality, if this is already disabled then go to settings>battery>3dots in the upper corner and battery optimization, see if whatsapp and facebook is in the not optimized category, if it isn't there go to all apps category, look for whatsapp and facebook, tap on them and select don't optimize
it's not an issue, more like an oversight on the battery optimizer |
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