Samsung 720N – Brightness Problem

Hello,
I have an issue my Samsung Sync master 720N. At a random time, the screen turns black for a few seconds as if its settings were reset and then the brightness menu appears and auto adjusts itself.
It's very annoying as I can't enjoy a movie or play a game without having this problem. I have looked around and on some websites I've seen the fact that it is an issue from the manufacturer. I have given it some thought and I find it impossible for the simple reason that it worked so well for over 4 years. I took care of it and it never suffered any accident. Is it really the time for me to acquire a new monitor ?
I hope not .. What are your suggestions ?
