Samsung refrigerator Rfg238aars lights blinking

Hello

I have a samsung refrigerator Rfg238aars that intermittently has an issue. When the issue shows up the display will go blank and become non responsive. The dispenser light will blink continuously but all other functions quit working. Refrigerator and freezer quit cooling along with all other lights. Sometimes it will take a few days other times a few minutes. Replaced display and main circuit board already and added surge protector to the unit. Unit is about 6 years old and has been trouble free until now.

any help much appreciated.

thank you

Adam