Surface keyboard has gone faulty

If the Surface keyboard is sticking or repeating/dropping keys, Microsoft classifies that as likely hardware failure and the recommended next step is to submit a service order.

For a warranty replacement path:

1. Sign in to Microsoft account | Select device for service.
2. If the keyboard or Surface is already registered, select it and follow the service instructions.
3. If it is not listed, select Don’t see your device? to register it, then continue the service request.
4. Find the keyboard serial number near the left side or center of the spine where it attaches to the Surface.

If the accessory is handled as a Microsoft PC Accessory rather than through the Surface device page, the documented path for most Microsoft PC Accessories is the Surface and Microsoft Accessory Warranty Exchange Request.

Before submitting service, one supported self-check is to inspect for debris and use compressed air to clear dust from between the keys. If keys are damaged, cracked, fallen off, or continue sticking/repeating, service is the recommended action.

If the warranty has expired, documented options include out-of-warranty service, self-repair by skilled technicians where available, or purchasing a new keyboard.

• Troubleshoot Surface Pro Keyboard or Type Cover | Microsoft Support
• How to replace your Microsoft PC Accessory under warranty | Microsoft Support
• Get service for your out of warranty or damaged Surface | Microsoft Support
• Hardware protection, warranty, and repair | Microsoft Support