I have a low amount of RAM, so sometimes if i'm also running other background applications the sim might crash on me if i let it restart on its own by pressing ok at that pop-up window. I have a feeling that this prevents saving the new configuration.
What i do is restart it on my own:
1) Change settings
2) Exit the sim
3) Launch the sim again
This way i have never had an issue with settings not being kept.
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