Hi, @Fernando_Matos! 
Did the Flash always appear when an image changes?
If yes, I have expirenced this too…
I came out with the solution that,
Replace the image component with Button component and don’t add the blocks for the button component
When you click the Change Image button, the image on the image component changes, right? and it also flashes before changing…
Replacing a button with an image component will solve the flashing problem.
Hope it Helps! 