Sorry about any hassle with spell-checkers. I know first hand that they can really mess up some sentences. It's possible that if there was a patch to the spell-checker software, it could have reset some preferences or added new words. As you continue to use it, it will re-learn which words you do and don't want to use so it will become less of an issue. However, if you're not a fan of spell checker and auto correct, you can switch this off under Settings > Language & Input > Spell Checker. I hope this helps.
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The spell check and auto correct settings are within the keyboard settings for whatever keyboard you are using. Keyboard settings are under Language and Input.
Settings > Language and Input > Keyboard