Yes, I have the same issue sometimes. As it connects to the network via our routers and then subsequently the connection to the HAP-Z1ES to our various control devices is also through the same router, I think it has something to do with how the Sony unit interacts with the router.
I've had to sometimes literally unplug the Sony from the wall to get it to connect. I haven't had any connection issues in about 4 weeks but I notice when the issue has happened in the past it's usually coincided with when new content has been automatically added or is being added to the device with the little spinning arrow icon indicating as such. I have two wireless routers in our house with 2 different 2.4 GHz SSIDs and the issue sometimes occurs regardless to which SSID the Sony is connected.
