Extremes (Access Point Mode, Bridged) Constantly Going Offline

I have multiple Extremes (all standalone access point mode, bridged with static IPs) randomly going offline. Each Extreme is connected directly to a main switch. Status lights always remain green however I cannot ping the devices, they do not show up in the Airport Utility and they cease to be accessible/visible via WIFI. Plus, when this happens, I often can STILL connect to devices (e.g. printers) that are plugged into the LAN ports of the "offline" Extremes.
They appear to drop randomly, i.e. not under any particularly heavy load or anything. When I feel them physically, they don't feel unusually warm or anything.
Thoughts? I have already done a hard reset and reconfig on one of the problem devices.

Hello Julesomar,
It sounds like your Airport Extreme is having intermitent connectivity issues. You have already done what I would have started with by resetting the device. I recommend next troubleshooting for sources of interference with the following article:
Wi-Fi and Bluetooth: Potential sources of wireless interference
Thank you for using Apple Support Communities.
All the very best,

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