Another workout for MIUI8 missed notifications
Disable MIUI battery saver and fix missed/late notifications
- Settings > Battery & performance > Manage apps' battery usage > Off
- Settings > Battery & performance > Power > Battery saver > Battery saver toggle off
- Settings > Notifications & status bar > App notifications > select apps that can show floating notifications and notifications on lockscreen
- Security > Permissions > Auto start > select apps that should get notifications after reboot
- Security > Settings icon > Cleaner settings > Clean automatically > turn off / Update automatically > turn off