Sounds like a network connection error, which will always be a failure mode for web apps and a SOB to debug. Perhaps it would be easiest to catch this error in the onFailure() call of your RPCs and display a message to the users telling them to check their connection or reload the page? That's what we do in our apps. We also have a logger RPC that mails any such error traces home, but if it is a network issue, you probably won't get those.
Hope that helps,
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