IONIC 4 : ion-slide is not catching click after page scroll

I am using ion-slides like below. When I click on ion-slide, it is calling test() method but when I scroll down the page and again tried to click on ion-slide it does not call test() method.
After 30-40 second If I try again it is calling the test() method.

html : 
<ion-slides>
    <ion-slide (click)="test()"> 1 </ion-slide>
    <ion-slide (click)="test()"> 2 </ion-slide>
</ion-slides>

ts:
test()  {
    alert('test');
}

Can anyone please provide any solution on this ?