We have a wifi network spread across two buildings. We're using the Cisco Aironet series APs all powered via POE. What i'm noticing is that the signal is fluctuating from 4 bars, down to 1 bar randomly and maybe even 0 and drops the connection. I can't seem to find any reason as the PCs aren't on the move and are in a docking station. There isn't anything that stands out that would cause any interference (Phones, metal cabinets). Any idea's on where to start? This is affecting mulitple users and applications.