I think this is probably also part of the discussion over at
Long Term Photon Connection Stability
that said maybe you could join in the search. As I wrote over there there are signs that it has todo with losing Internet with gaps in Internet connectivity with my working hypothesis that cloud pings timing out somehow lead to too aggressive resets sometimes also resulting in permanently failing reconnects. My current test with a Spark.disconnect() in setup() has
been running for 1 day and 7 hours so it is still too early to call.
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