• Can you check E.getErrorFlags() and see if it reports anything? The flags get reset each time you call it so you should be able to see if something's causing a problem.

    It sounds to me like data from the Wifi module is getting lost again - IPD is part of the data sent when data is received - usually it should be stripped out but presumably it's got out of sync somehow. Are you using the old firmware when you get that, or the new one?

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