Joycons buzzing in Portal Knights on Nintendo Switch
It is completely normal. Almost all of the games for the Switch have something that makes the joy-cons vibrate. I'm sure it won't ruin your joy-cons. If you want to turn off vibration, go to system settings. Go down until you see Controllers and Sensors on the left side. Click it and go down to Controller Vibration and select it. It will turn off your vibration. Here's a picture of what it looks like. It's a bit blurry, but it's the best I could find. It should suffice.
