ESET app lock

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Hi,

Today i tried to change new app lock pin and i encountered in a strange behavior. One of the selected pin got sluggish and became a grey circle. It is kind of a slow behavior and if i type fast the digit pin number will not be excepted. Is that a typical behavior for keylogger app installed? The funny thing is ESET mobile security will find nothing.

The question among other is how to prevent or block keylogger app in android? I have Zemana and MalwareFox antimalware with option to find keylogger apps.

None of them shows no infections.