Scintillements /saccades/ clignotements quand scrolling sur le Dock et Safari

Bonjour,
Depuis quelques jours je constate un problème graphique sur Safari et sur le Dock.
Mon matériel:
MacBookPro 15'' Retina, octobre 2013, achat reconditionné Apple Store.
Dès que je "scroll" verticalement et horizontalement des scintillements, saccades, presque des clignotements, apparaissent.
Phénomène assez difficile à décrire à l'écrit mais visuellement assez dérangeant.
Une fois les mouvements terminés, l'écran est stable, pas de problème.
Après avoir contacté Apple par téléphone, j'ai fini par réinstaller OS X sur les conseils du technicien Apple.
Cela n'a pas changé le problème d'affichage.
J'utilise donc FireFox pour l'instant et éviter de scroller latéralement pour changer de bureau afin d'éviter ces scintillement/saccades/clignottements désagréables..
Auriez vous des idées pour résoudre ce problème?
Serait-ce un problème matériel (carte mère, carte graphique)?
S'il le faut je prendrais RV en Genius Bar car mon MacBookPro est toujours sous garantie.
Merci!

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