Cannot obtain DHCP IP address via ethernet for Airport Express running 7.6.4

Printer connected to LAN port on Airport Express running 7.6.4 cannot get IP address via DHCP.  Airport Express is connected to an existing Wi-Fi network.  Downgrading firmware version to 7.6.3 or lower resolves the issue.  100% reproducible.  Tried this with 2 Airport Express devices and both had the same issue. Printer is a Star Micronics TSP 100 (point of sale receipt printer). This printer is used by almost all iPad based POS systems.  It is affecting business operations.

Well I solved my own problem and it was working fine for months until Yosemite came along....
To tether my iPhone USB connection to an Airport Express Base Station (AEBS)- i did the following
1. Connect iPhone and turn on Personal Hotspot using USB
2. Going to System Preferences on the Mac click on Network
3. Set up the Ethernet setting with a static IP - (manual)
Configure IPv4 Manually -
IP Address: 192.168.2.2
Subnet Mask: 255.255.0.0
Router: 192.168.2.1
Next step is to configure the AEBS
Start from fresh -
Create a New Network
Internet Settings set to :
Connect Using: Static
IPv4 Address: 192.168.2.3
Subnet Mask: 255.255.255.0
Router Address: 192.168.2.1
DNS Servers: 192.168.2.1
Then under the Network tab the router mode is set to DHCP and NAT
It worked beautifully until recently , after the upgrade to Yosemite it was working for about 1 month and then as of yesterday it stopped working.
I am not a networking guru and I am open to suggestions on a better setup. Has anyone got this setup working too?

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