Display stops working

I have an LG LSC 26905TT. I can get it to function properly by unpluging it and pluging it back in. This lasts for about 3-7 days.
The outward indication of the problem occuring is that the control panel stops working and the only lights that show up (no matter what you press) are two of the freezer lights. It will dispense water or ice depending on the last setting it was on before it goes out.
How can I fix this?