I had someone hang drywall in my basement. They used screws for the studs but liquid nails to attach to 4" vertical I-Beams that support the walls next to a fireplace hearth. The drywall is now detached from the I-Beams... ~6 months after being hung. How can I reattach it? I am considering using drywall anchors placed just beside the beams to pull the drywall up against the beam... Any other ideas?