Aeon Labs 4 Way Light Switches Response Delay?

Hello,

I am new to this. I installed several Aeon labs switches in my home. The single pole switches and the 3 way switches work fine. The 4 way switches has a 30 second response delay in responding to turning it on and off from the iphone. I followed the 4 way switch diagram installation instructions. Any thoughts? any similar issues? Thanks!