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Once I restored above option to default value, keyboard started properly working inside Viber app. But, if you are in the same situation, this post can save you from the trouble! Simply check that your option ‘ Don’t keep activities‘ is unchecked/disabled and revert any system changes that you’ve made, and the problem should be resolved (assuming no other factor is involved). Users need to tap onto Android version number area few times (3 or 7 or more) to unlock it. Of course, this cannot happen to most ordinary users, because Developer menu is hidden by default. But, it has a downside as well, since every process or tab needs to reload into RAM as soon as they are brought into focus again. It is useful for debugging purposes, and it greatly saves device’s internal RAM memory.
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if you play a radio station or some other background music, they will immediately stop playing). This means that each tab in, say, your Chrome App Browser, Music or Radio will stop executing if you move onto something else or desktop screen (e.g. What is this option doing? This option will destroy every app’s process as soon as they lose focus.
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