AXs keep disappearing from network

I have an Airport Extreme Base Station and two Airport Express units upstairs for Airtunes. All of the units have the latest firware upgrades. The network uses WPA2 Personal and WPS.
On multiple occassions, both of the AX units will stop streaming music. What I mean by that is the units will appear in the Airport Admin table and the lights on the units are green, but they will not stream the music. I usually have to reset the units in Airport Set Up Utility and let them restart in order to get them working again.
For awhile I had only 1 AX unit in my livingroom and don't think I had this problem. It seemed to develop shortly after I added a second AE unit on the porch. That unit was a demo model from my local Apple store but they said it was in perfect working order.
If I don't stream music for several days I usually find that the AXs don't respond and have to be reset. If I stream music for several hours, most of the time they will drop off in the middle of playing. They both seem to go off line together (it's all or nothing for music streaming.)
I have tried changing the channel (from 11 to 5) thinking it could be an interference problem but that hasn't helped.
Any thoughts or suggestions would be appreciated.
Thanks,
David

I too, started having problems when I added a second AX to my network. They both worked for about 36 hours and then one "disappeared" from my network.
Haven't tried resetting or configuring via ethernet connection. Just noticed this a.m. b/4 leaving for work.
I've been struggling for the better part of a week trying to get my home wireless setup and thought that I had only to encounter this new setback this morning.
I'll reply again if I'm successsful.

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AXs keep disappearing from network

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