why does pygame.display.update stop working after being called a set number of times?

[Faheem Lashari]

When running I am blit'ing some text onto my surface (WIN) and I want this to be shown in the game so I call pygame.display.update to update the display, this works perfectly fine until the loop has iterated around 75 times and after this the display stops updating . Code below

[Victor Nijegorodov]

Perhaps you do not free some resources?