How do I get MIUI to allow notifications for reminder apps?

I'm using an MI phone (Redmi Note 4G), it runs on MIUI v7. This is a problem that a lot of people have been facing for a really long time now: Push notifications for reminder apps (Say Wunderlist, Google Keep, Any.Do etc.) don't work. Mostly they don't work at all, sometimes they are delayed for random number of minutes / hours for absolutely no reason. How do I get MIUI to allow these notifications? Here is what I've tried: 1. I've tried "locking" the apps into the apps tray (So that when I clear the RAM, that particular app isn't cleared ) Result: Doesn't work. 2. I've given **all** permissions to the concerned apps. Even those permissions that were obviously not required for the app to do it's basic task: Remind me of my to-dos. Doesn't work. 3. I've made sure that I've enabled **all**notifications in both the MIUI settings and in the settings of the app Doesn't work. There is only thing that **does** work: Not force closing the app (by pressing the back button for a few seconds). Even if I do so, the reminders only work fine for a few minutes: say for half-an-hour or an hour. Reminders that come up later than that don't work. Here is an ongoing discussion on the same topic: http://en.miui.com/thread-19270-1-1.html (miui forum)