The original Nintendo Switch uses Joy-Con controllers that attach to the sides by rails, and a controller that drifts, disconnects or will not pair has causes in the contacts, the firmware, the battery or the wireless link. Nintendo's own help explains that Joy-Con connect to the console wirelessly, so a Joy-Con that drops out may be low on battery, out of range or being interfered with. Check the battery by looking at the controller's icon on the Home menu, and charge it by sliding it onto the console for half an hour.
The checks in more detail
If a Joy-Con is not recognized, slide it onto the console's rail firmly until it clicks and see whether it is detected; if it works attached and not detached, the wireless link is the issue. Remove and pair again in System Settings, Controllers and Sensors, Change Grip/Order, and update the controller firmware under Update Controllers. Drift, where the stick moves by itself, is a known fault of Joy-Con.
Calibrate the stick in System Settings, Controllers and Sensors, Calibrate Control Sticks: place the stick at rest and follow the prompts. Clean around the stick with a dry soft cloth, and a cotton swab with a little isopropyl alcohol can lift dust, but do not pour liquid in. Test the stick in the calibration screen. If calibration does not help, drift usually means a worn part inside, and Nintendo repairs Joy-Con drift for free in some regions, so contact Nintendo Support with the serial number.
For wireless dropouts, keep the console and controllers away from Wi-Fi routers, USB 3 devices and metal cabinets, and make sure the dock is not between you and the TV. Turn off Airplane mode, which disables the controllers' link. Try the controller on another console to find the fault. A Joy-Con that fails to charge may have dirty contacts on the rail. A Pro Controller is an alternative, using its own USB-C cable to prove the console.
Differential
Likely causes of “Nintendo Switch original model controller will not connect or keeps disconnecting”, and how to tell them apart
- 1
A low Joy-Con battery
What separates it Disconnects or lag
How to confirm Charge on the console for half an hour
- 2
Stick drift
What separates it The cursor moves by itself
How to confirm Calibrate the stick and clean around it
- 3
Old controller firmware
What separates it Odd behavior
How to confirm Update the controllers
- 4
Interference or range
What separates it Dropouts near routers or cabinets
How to confirm Move away and avoid metal
- 5
A worn part
What separates it Drift persists after calibration
How to confirm Contact Nintendo
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether it works attached
- The battery level
- Whether the stick drifts
- Whether Airplane mode is on
Try in this order
0 of 6 completedCheck the battery
ReversibleAnd charge on the console.
Reattach the Joy-Con
ReversibleUntil it clicks.
Update the controllers
ReversibleIn System Settings.
Calibrate the stick
ReversibleIn Controllers and Sensors.
Clean around the stick
ReversibleDry and gentle.
Contact Nintendo
ReversibleIf drift persists.
Model-specific
What is true of this model and not of its siblings
- Joy-Con rails
- Contacts there can charge or fail.
- Calibration
- It can fix mild drift.
Stop boundary
When this stops being a self-service repair
- !If drift remains after calibration, contact Nintendo about a repair
- !If a controller fails on another console, replace it
- !Update the firmware
Evidence ledger
Sources behind this answer
Nintendo's guidance on a 12-second power hold and 30 minutes of charging.
Repair guide to vents, fan and software causes of a hot Switch.
The Formatting Options route to Clear Cache.
Exact questions
Common questions
Why does my Joy-Con drift?+
A worn part inside the stick.
How do I calibrate the stick?+
System Settings, Controllers and Sensors, Calibrate Control Sticks.
Does Nintendo repair drift?+
In some regions for free; contact support.
Why does it disconnect?+
A low battery or interference.