Can the freezer temperature affect the fridge. My freezer is on the coldest setting. Eggs have already burst too.
Yes, the freezer temperature usually affects the fridge. Unless you have a high-end fridge this is how they operate:
1) One control operates the temperature of the air that goes into the units. This control is usually labeled "freezer".
2) The other control operates how much of that air goes into the freezer and how much goes into the fridge. This control is usually labeled "refrigerator".
So, for example, if you have a low-end fridge, you'll likely have two dials labeled something like 1 to 5. A setting of 3 on the freezer may mean the air temperature is 25°F. A setting of 3 on the fridge may mean that 10% of that 25°F air goes into the fridge and 90% goes into the freezer. If you turn the freezer temperature dial down to lets say 15°F then BOTH the freezer and the fridge get 15°F air blowing into them (90% to the freezer and 10% to the fridge). Put anything near that incoming 15°F air and it'll freeze even in the fridge. Note: these numbers are just randomly made up to give the idea of how to better control things, they probably aren't exactly correct for any fridge/freezer combination.
This is done since you usually have one compressor and one blower but you want to control two separate chambers. So, you don't get independant control of either.
I do have to ask, why keep the freezer so cold? Food doesn't last significantly longer and it leads to far more energy usage and frozen items in the fridge.