Wifi extender as a bridge

Hi guys, I work in a hospital. Radiology has three C-Arm machines that do not have wireless NICs (just an ethernet port), but they are constantly being wheeled around halls so its not practical for them to not have wifi access. I have permanently fixed a wifi extender to the housing of each C-Arm to act as a bridge to the wifi. The C-Arms plug into the ethernet port on the bridge which is grabbing the signal from the APs. The power supply for the bridge comes from the C-Arm itself. So when the C-Arm is turned on, the bridge boots up as well. The bridge and the C-Arm have consecutive static IPs.

Bridge: 172.30.14.58

C-Arm: 172.30.14.59

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When I turn the C-Arm on with a ping -t running on the both addresses, I will start to see successful pings on the bridge address first.

At this point the C-Arm itself is not connected yet-- only the bridge. As soon as I see the pings drop on the bridge, I start seeing successful pings on the C-Arm address. This is how everything should go if its working properly.

The problem I'm having is just inconsistent connectivity and I think its between the bridge and the C-Arm. Every so often I get a call saying one of the C-Arms wont connect. Ill throw a ping -t on both addresses, boot it up, see the pings start on the bridge address, and for whatever reason the C-Arm just doesnt want to connect. The bridge address just pings endlessly while the C-Arm ping times out over and over or says Destination Host unreachable.

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Nothing has changed. Its configured the same as the other two C-Arms and they're working fine.

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I feel like I've ruled out:

...any issue with the wifi itself. No other devices have issues at all, including the other two identical units.

...incorrect configuration. Everything works fine for weeks at a time then all the sudden I get a call.

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I don't know if the C-Arms themselves just aren't very sophisticated for networking purposes or what. It seems like the miscommunication happens on the handoff of the signal from the bridge to the C-Arm. There's not much you can do on the C-Arms config-wise.

If anyone has any ideas I would love to hear them. Thanks.