I have two wired SB units a M2000 and M1000 and a R1000. One of my favorite jazz stations WLNZ plays beautifully on the M1000 and R1000 but never connects on the M2000 which is the main unit for the whole house.
The M2000 is wired using CAT 6 and is relatively close to the modem/router and the M1000 is a long way from the modem using CAT5e.
They are all up to date as far as their firmware is concerned.
Thank you in advance.