Refrigerator quits cooling (lights/freezer work) & 24 hr unplugged only fixes it for < 2 weeks
My guess is it is not defrosting properly or a fan has failed. I go with not defrosting because of the 2 week cycle 
a failed fan it would probably not cool well at all. If not defrosting it takes time for the frost to build to the point of limiting the air flow. The display not properly functioning may point to some type of control board failure. It may be repairable and if you search online with the model number you will probably find the correct board for your model. Some of the sites that sponsor repair parts can be quite useful I have fixed stoves and dryers many times with parts from these sites.