LAG ON INPUT FX

My REKORDBOX is lagging like you can see on this video
https://www.youtube.com/watch?v=ZwesstM94-w

When I press FX buttons, loops or reverse function my REKORBOX starts lagging and does the FX after a while. 

Cuando le doy a los botones de efectos, loops o al reverse a veces tarda en reaccionar y hace la funcion pasados unos segundos. This happens to me very recently, until now it worked perfect. 

I downloaded and  reinstalled the program, I tryed with REKORDBOX 5 and still happens. 

Sorry for my english :P