Lag and disconnections on Bluetooth devices can be due to WiFi interference
Resolve Bluetooth Wireless issues on Mac OS X
Resolve Bluetooth Wireless issues on Windows 10
+Install and use the SecureDFU firmware update
Some K780, K375s, and K850 keyboards may experience the following:
When your keyboard is in sleep mode, it takes more than one keypress to wake it
The keyboard enters sleep mode too quickly
If you are experiencing this problem, please download the Logitech Firmware Updating Tool
(SecureDFU) from your product's Download page and follow the onscreen instructions.
NOTE: You’ll need a Unifying receiver to perform the update.
Install and use the SecureDFU tool
1. Download and open SecureDFU_x.x.xx and select Run. The following window appears:
NOTE: During the firmware update process, Unifying devices will be unresponsive.
2. Click CONTINUE until you reach the window shown:
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