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You should update your profile to show Year and Trim of you Sonata, and Location...

Weird behavior like you describe could be a voltage / battery issue. I saw weird-ness on my old Explorer when the battery started dropping in Voltage. Would not think it's you key fob since all the other issues would not be related to that.

If your car has less than 50K and it's not the battery you should have the dealer fix. I know the dealer quoted me Like 185 for a Interstate AGM replacement. (Don't need it yet, just wanted to establish a base line). Shop around for Battery prices if that is the issue.

Good luck
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