I have a pair of the Splatoon 2 colors from Japan. The left one started to not take inputs properly and then started drifting. Was no real issue, though. Called Nintendo, they set up a repair/replace service and they were out, repaired and back within 7 days...free of charge.
Easy Peasy
I have zero worries with Nintendo products. If there is an issue their customer service, time and time again, has been fantastic.