If your Slim X1 Bluetooth Backlit Keyboard (ST-BTSX1M, ST-BTSX1S) disconnects, or does not reconnect after your computer sleeps, try these steps.

How to stop the Slim X1 from dropping the connection

1. Charge the keyboard, since a low battery is the most common cause of dropouts.
2. Confirm you are on the correct device channel. The Slim X1 pairs with up to three devices, so press the matching device key before typing.
3. Remove or forget the Slim X1 in your computer's Bluetooth settings, then pair the Slim X1 again. A stale pairing record often causes the after-sleep failure.
4. Keep the keyboard within about 30 feet of your computer, and away from USB 3.0 hubs that cause interference.
5. If dropouts continue, connect the keyboard in wired mode with a USB-C cable to confirm the keyboard itself is working.