There are a few ways to fix Joy-Con drift on your Nintendo Switch, including updating your controllers and calibrating the sticks.
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broken joy-con, could I fix this at home? : r/nintendohelp
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How to Fix Joy-Con Drift at Home! No tools required!
How to Fix Joy-Con Drift at Home! No tools required!
How to Fix Joy-Con Drift - Nintendo Switch Guide - IGN
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