IPhone lock button chooses when to work, what do I do?

I had a Lifeproof case on my iPhone but when I came out of the pool, there was water inside, most of it was by the bottom. Now, I've dried it and everything seemed to work fine, but a few hours later now, the lock button won't lock but when i hard reset by holding down the lock button and the home button, it works! Any help would be appreciated, what do I do?

Dry it out more.

Those Lifeproof cases suck and are poorly made. I had 2 and both ripped along the seam where the screen protector attached to the case.

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