Ok so I've now tested this using different USB plugs, cables and computers. The result is always the same, after maybe one or two hours. The Espruino WiFi seems to stop executing, and there led that is being used for sleep indicator, starts to flicker quickly and is no longer brightly lit.
Does this sound like it's trying to sleep?
I even added a ping back to the raspberry pi to make sure the connection stays alive every 15 seconds.
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