My original left joycon had drifting problems beyond repair and I didn't even use it that much, maybe like 100 hrs. I had to buy another pair and everything is good so far but again I don't use them that much, the video about cleaning them (compressed air, contact cleaners, alcohol, etc.) never helped me and I've seen A LOT of threads about this issue, Nintendo really has to adress this problem because is a little bit ridiculous.
I know... my English sucks.