Hello,
i buy 6 WAP551, separate in 2 buildings ( 3 for each) , in each i setup with single point setup, with firmware 1.1.0.4 ( i try also 1.0.4.4), and regularly one ( not always the same) lost internet connection ( the internet is working for the two other ), only solution is to power off/on.
the two buildings didn't share the same internet. Wap551 work with DCHP. i have the same pb in the two buildings.
with windows we have connection limited, on mac os no connection is possible.