Airport Express - Nailed the problem with Airplay fall out

Question

Yes, finally I nailed it after reading hundrets of post with a huge variaty of slutions - here it is:
Set up:
- 1 Time Capsule
- 4 older Airport Expres (still new enough to be supported by Yosemite)
- 1 Very new Airport Express (2,4 and 5 Ghz)
Main configuration:
- Time Capsule extends the WiFi ADSL modem from my internet supplier. WiFi is disconnected on the suppliers modem. Time Capsule sat i "Bridge mode".
Setup - Base Station:
With Password
Setup - Internet
Standard DHCP setup
Setup - Wireless
Network mode. Time Capsule sat to "Create wireless network. All other Airport Express are sat to extend the network.
Setup - Wireless - Wireless options
Checkmark in 5Ghz mode (not necessary)
HERE IS THE TRICK!!!
Radio mode: 802.11 a/n - 802.11 b/g - NOT AUTO!!!!
2,4 Ghz: Manually sat at 13
5 Ghz: Manually sat at 48
Important. Before choosing  channel 13 and 48 I downloaded WiFI Scanner and saw the extreme amount of networks near by. Found an empty slot at 48 Ghz for 5 Ghz channel, and the most empty slot on the more than 15 networks with possible inteferance.
Thats it. Haven't had a fall out ever since

Answer 1

Hello Northwolf75. Welcome to the Apple Discussions!
It sounds like you should be taking advantage of configuration profiles.
The AirPort Express Base Station (AX) can store up to five different configuration profiles. You will need to use the AirPort Utility, located in Applications/Utilities to create & save these profiles.
To create a new profile:
o Open AirPort Utility, select your AX from the list, and then, click "Manual Setup."
o From the AirPort Utility menu, select "Base Station," and then "Manage Profiles."
o Click "+" to create a new profile; give it a name, and then, click OK.
o Set options, such as network name, passwords, Internet connection method, etc.
o When done setting the options, click Update.
To switch profiles:
o Open the AirPort Utility, select your AX from the list, and then, click "Manual Setup."
o From the AirPort Utility menu, select "Base Station," and then "Manage Profiles."
o Click on the desired profile, and then, click OK to apply the new profile and restart the AX.
Just remember to switch to the desired configuration profile before removing power from the AX.