That's a faulty switch rather than a faulty joycon.
bah got it all bloody set up too! Well hope smyths got more stock then as the one I got was last oneThinking it can't be switch now, in handheld mode both joy con's work zero issue, put it into table top mode and only used right joy con on its own which gave the issues and it worked fine for 20 laps without fault.
Could interfence when offline mp be a cause?
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I was competitive to a degree with mk but eventually couldn't keep up with the speed of the better players.