That's normal. First thing I would do is shut it off, let it cool and try and drain some of the bottom off. You might be starting to have some sludge/iron/rust buildup in the bottom. Pull and inspect the anode while you are at it. Use a hose to agitate and flush the bottom. If the anode is okay, reinstall. If not replace. Are you sure it is a dual element? Mine is a 50 with only a single element.
If it's up in your attic, during the summer the surrounding ambient temp is hot. During the winter it is cold so your water heater has to work harder. Suggest you adjust it to 120 degF when you adjust your clock forward in the spring and up to 140-150 degF when you adjust your clock back in the fall.
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