Yes, I should have running it all the time, battery saver is off, autostart is enabled, app is allowed to run on background, not sure if there is anything esle to set up.
I have updated through fastboot from 12.5 and recently I've made factory reset so in this way it should be okay.
I have latest release of Miuios and it often times happnes that my notifications arrive lately.
Sometimes I don't even hear when somebody is calling me on Whatsapp, battery saver is disabled and autostart is turned on. Is there anything else I can do?