hello everybody
i have bought a tv 40pfl5606h/12 but I have problems with the TV it stutters. When I am watching the picture by itself small and large back or face-down. that lasts a second or two and is back to normal. sometimes it happens after the other and sometimes once in a while. does anyone know how this can be? or what I can do about it?

i have already changed the tv at the store once and now with other tv happens again

thank you in advance