Different thermal results

Hello, Does any one know how my results would have changed? I had a temperature change of about 7 degrees, but now I am getting a bigger change.   I don't remember changing any settings, and I don't have file anymore from the model with only 7 degree difference.
Thank you,

The solvers and thermal models have not been changed for quite awhile, and we have many regression test models that would detect any significant fundamental changes.

Unfortunately if you don't have a model to compare with it is quite hard for anyone to say what has changed.

You can try to export the model as a ".fes" model script which tracks the modes changes (instead of saving the binary model data it saves a log of GUI actions in a JSON text file), or possible export as a MATLAB ".m" script file. However, if you have loaded/saved repeatedly in the same model the old changes might have been overwritten.