Ok, great. If you used software serial (as you mention on http://forum.espruino.com/conversations/329943) it's very likely you'd be getting all kinds of intermittent communications issues, which could be what you're seeing?
Espruino's hardware serial is pretty solid - and in fact if any buffers overflow so data is lost (which would happen if Espruino wasn't processing it fast enough), it should output FIFO_FULL to the console so you can see something has gone wrong.
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