why is my bathroom sink separating from the wall?

we just had our house built aug. of 07′, our bathroom sink is in the normal (slandered) counter top sink holder with the one big cabinet under and 3 goers on the side… well the sink counter to is pulling away from the wall, why? how do i fix it? the guy came back after a year for the 1 year fix touch up and said it just need caulking, so he did so and that lasted for 2 months and now i can see its separating more, and when i lift up on the sink counter its not all attached that’s separating too! whats going on?

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