My wife's macbook had similar issue. It started exactly after 1 year (one week after the warranty). I thought that something is wrong with the graphic card and took it to the apple store. They could not reproduce the problem but extended the warranty for another 3 months. The screen progressively got worse and would require several readjustments/tilting. It didn't go blank but gradually faded before finally blanking or freezing.
I took it back to the apple store and they figured out some issue with the screen. Original repair cost was $280.00 or more but they gave me 50% discount. Screen and frame was replaced and now the macbook works perfectly fine.
I initially thought some cable connecting to the screen but it seems like that issue is more with the screen and the panel that goes around the screen.
I hope it helps.
