I may be totally wrong, but just one suggestion which may be simple to test: Have you tried bumping the “–asynchronous-concurrent-upload-limit” from its default of 4 down to 1? I had a curious upload problem where my cloud provider (German Telekom) closed my connection when I tried “too many” concurrent uploads. After going back to a single upload process (–asynchronous-concurrent-upload-limit = 1) I’m fine again. See this thread for details.
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