GE side-by-side defrosting than refreezing daily now

Help please, After replacing the defrost heater assembly and defrost thermostat due to excessive freezing of the coils and ice tray assembly, my freezer now works perfect for about half the day than defrosts and melts all the ice it made in the bin that day, then refreezes. Also, the meat bin in the fridge side freezes anything in there while the top of the fridge is barely cold? Not sure what else to replace except possibly the motherboard, since I notice that when the defrosting is going on, the water and ice dispenser does not work. Any ideas would be appreciated, since nothing can stay in the freezer for now except melting ice!