WI-Fi omnidirectional AP’s

South West State University installed a series of four WI-Fi omnidirectional AP’s spread across the ceiling of the main floor of their library. The main floor has several large, open areas plus two dozen or so small offices spread around the outside walls. The WLAN worked well for one semester, but now more students have laptops with WI-Fi built in, and performance has deteriorated significantly. What would you recommend that they do? Be sure to support your recommendations