I have a fagor refrigerator that freezes everything. any advice

Make sure your filters are clean also nothing blocking air flow check and clean front vent

I'm not familiar with that make, but unless it's a dual evaporator model, cold air comes from freezer and is transferred to fridge by a fan. I would check damper assembly between fridge and freezer. If no problem there, then thermostat or control Board is most likely the problem.