Default Wifi passwords not staying

Hi all. My Note 3 no longer keeps the wifi passwords. Each time I log on to a wifi I have to re-enter the passwords. Anyone know why? This wasn't happening until yesterday when I momentarily changed Sim cards.

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Sony Ericsson P910i- Sony Ericsson P990I - Samsung i8910hd - Samsung Galaxy S2 - iPhone 4s (blasphemy) - Galaxy Note III