After 2.4 update, Apple TV no longer connects to 5 Ghz network

Hi,
I have a dual-band AirPort Extreme with 2 networks. One 802.11n only 5 Ghz, the other the slower speed. I used to have the Apple TV connected to the 5 Ghz network and it worked fine. But now it won't pick up an IP address on that network. I have to connect to the slower network now.
Is there any remedy to this? When connected to the 5 Ghz network, Apple TV just gets a self assigned IP address. I even tried manually assigning an IP address and that didn't work. It just wasn't able to connect to the Internet.
I also recently updated the AirPort to 7.4.2.
Thanks,
Brendan

I had this when I updated to 7.4.1 and solved it by changing the channel from automatic to manual and selecting 44
The reason for this is that my TC was bought in the US and my MBP in the UK where there are slightly different frequencies used. Thus, my MBP (UK) wasn't able to see the channel that the TC had selected. Changing this sorted it out.
This was at 5GHz
To change the channel, select your Airport extreme in airport utility, then manual setup. In summary, click on the channel word, which takes you to the wireless config. If you can't select anything other than automatic, then press alt and click automatic and you should be able to manually select a channel.
Hope that this helps

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