Airport Express disconnects from LAN overnight

I have set up a brand-new Airport Express (v. 7.6.4) recently. The AP Express is connected via the Ethernet 1 port to a Power Mac running OSX 10.9.5 (Mavericks). The AP Express is in "Join a wireless network" mode, and it connects to a LAN consisting of a cable modem/router, a "smart TV," a printer, and a MacBook.
Most of the time, all of this works fine, and the Power Mac gets a nice fast wireless Internet connection, which is the main objective of having an AP Express. (I'd rather use a direct Ethernet connection between the Mac and cable modem, but that would require snaking a long ugly cable thru my living room somehow.)
However, once or more per day, the AP Express gets disconnected from the host Mac (and the network) The symptom (sometimes) is that AirPort Utility reports that "no configured Airport base station has been found." Another symptom (sometimes) is that the AP Express is visible, but is reported to have a "self-assigned" IP address. It's SUPPOSED to be getting its IP address via DNS, and if it can't do so, no Internet connection...
This **seems** to happen when there is no traffic between the host Mac and the AP Express - most typically, overnight. I don't know of any "sleep" mode on the AirPort... ?
Sometimes, I can get the connection back up by tweaking a harmless parameter in AP Utility  and forcing it to "update" itself. In the worst case, I have to power down the AP Express and reconfigure the whole thing.
AFAICS, when this happens on the AP Express, the other devices are talking nicely to the cable modem.
At this point I'm at a total loss.... I thought that this would be a very simple installation, it's very disappointing to have to in effect "reinstall" the AP Express every morning...
thx -- John

I phoned Apple Care and brought the AirPort to the Apple Store

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