Maybe A/C is unbalanced
I am not sure, but from what I learned is the A/C may need to be balanced. I read this in a mold course. I found that A/C's can sweat and this also may be causing water to drip down toward certain areas of the home.
Try looking through the A/C system. If you need more assistance hire a professional or read through the mold removal course called Mold Manuscript
It was fairly good course and did help me with my stuff, also they give a couple free course away to help you. The guys name is Maurice... does a good job at explaining things.