Using time capsule as network extender kills network
I have a number of Airport Express components with that I've accumulated over a few years that are running on Firmware 7.6.4
I recently purchased a Time Capsule, its running 7.7.3.
The network topology is
Airport Extreme in bridge mode attached to ADSL router via a switch.
Two other Airport Express units on the same network.
This all works fine.
When I extend the network with the Time Capsule, this causes clients to no longer be able to connect to the network when they are in close range of the Time Capsule, and frequent drop outs elsewhere on the network. As a result, the only way I can get Wifi access is to disable the network on the Time Capsule and use it on an ethernet connection.
In the past I had a similar problem and solved it, apparently at least in part, by downgrading the old Time Capsule to 7.6.4 but this no longer seems possible as there is only the option of 'other' when looking for different firmware versions. I'm not sure thats the right fix in any case.
Any ideas why this new Time Capsule is incompatible with the other devices? I don't have many setup options that I could have got wrong, it
MacBook Pro with Retina display, OS X Yosemite (10.10.4)