It takes time to focus the input

friends had been developing an app in ionic 3.9.2
The main page is always the login
For some reason that I have not been able to identify the app on Android recently, it starts well but in order to take the focus of the input it takes a long time to do so, I click several times until it does but it is not normal behavior. the version of the android platform is 7.1.4
I used to do it well, but recently I noticed that I am presenting the problem and I am unable to determine what it should be.
If anyone has any idea where to look for the error, I would greatly appreciate it.