The matter of a fridge cooling some but not enough has come up before on this forum. What can happen (not necessarily has in this case) is that something massive is pressing up against the cover over the evaporator coil in the freezer. This can interfere with the automatic defrost cycle that is entered every so many hours. That massive roast beef or whatever absorbs a lot of the heat from the defrost heater, keeping it from melting all the accumulated frost on the coil. After so many cycles, so much ice has accumulated on the coil that the air can't flow over it very well, cutting its cooling capacity drastically.
It usually isn't too difficult to see if this is the problem. Remove a lot of the freezer contents to coolers or blanketed boxes. Remove whatever shelving is required to get at the panel over the coil, and remove that. Visual inspection will tell you if there is relatively little frost or a massive block of ice in there. If the latter, a hair dryer can hasten the defrosting.
The above may be a long shot, and it doesn't take all that much time to check, and if a coil overwhelmed by ice is the problem, the cost to fix is zero. Then you know to keep big things from being crammed into that area of the freezer section.
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