I also own a model # TT18DKXRQ01 Estate refrigerator and my freezer door pops open when I close the refrigerator. As you stated, this is caused by the magnet in the freezer gasket not being strong enough to hold. As far as I know, they do not make a stronger freezer gasket but even if they did, it would probably be too costly considering that a standard gasket replacement costs $80.
My solution was to install an adhesive child safety lock on the top of the freezer near the door handle. I purchased the 'Safety 1st Lock Release Fridge Latch' model # HS038 from my local Walmart store for around $5.
You may find this solution to be slightly inconvenient at first but you will get used to it. It sure beats losing food because the freezer door was accidently popped open.
Product information:
http://www.safety1st.com/usa/eng/Products/Home-Safety/Latches-Locks/Details/482-HS038-Lock-Release-Fridge-Latch
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