My iphone 4s' brightness is turning itself low?

No I don't have auto brightness on, it's off. How do I fix this? Is it a bug? I have the iOS 6.1.3 installed.
I did drop it in water like 2 weeks ago but I made sure all the water came out, my step mom dropped her phone in the toilet like a year ago and till this day it works perfectly fine! So why is mine having problems?

My current iphone 4s has been through the washing machine and even though i got all the water out it has problems like not always charging, it doesn't hold battery for long, it doesn't connect to its 4g internet, and like yours sometimes it will get dimmer. I then just put it back up to the brightness and it stays for a while. So i think i may have to do with the water

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