Like Kevin said. do not have them near each other (maybe at opposite ends of the warehouse) and have different channels. I also have motorola scanners and they are not 5GHz capable, so you'll want to look at your air space with a wifi scanning tool and determine what channels to use. I turned off smart channel on 2.4GHz cause it didn't work well for me. I statically programmed them to 1, 6, 11 (I have 3), the recommended channels for 2.4GHz. Chose one of these channels for each AP, a different channel for each, and try to avoid sharing channels with other wifi sources.