Some people are having issues with their new Nintendo Switch controllers

Some members of the press, ourselves included, have had Nintendo's Switch console for a few days now in advance of its March 3 release. 
And some members of the press, ourselves not included, have reported issues with the left Joy-Con controller. Left shark would be (even more) ashamed if this was 2015.
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The left Joy-Con controller, these other early Switch owners report, seems to occasionally register movement with a d