KD75X75WL white spots in bright screens

[normanos]

Tv is less than year old. Since first day I had white corners, but suport site says it's normal, but I don't think so as other TV never had this. 

 But recentlly I noticed white spots (squares) on screen, but only when bright scenes. When it's black, it's black. 

Tried to change TV picture settings, power saving e.t.c. even did reset. Also disconected all conected cables, liku HDMI, USB. 

 Maybe some one have idea what to do?

 Thanks.