You're phone may have sustained water damage in one way or another. You may have dropped it in water, your baby putting the phone in his mouth or even too much humidity can cause the phone to get moisture. Bring your phone to a Telus store and have it checked.

There was a similar question posted here which might give you some tips to solve the problem on your own. But be very cautious as it might lead to further damage on your phone. Do it at your own risk.
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