After prolonged use and numerous issues with the Keychron K8 in Bluetooth mode, I concluded that the problem was entirely hardware-related after exhausting all possible software solutions.
Upon opening the keyboard, I noticed that the Bluetooth module was placed in a highly unsuitable location—sandwiched between the aluminum case on top and the battery underneath. This positioning severely impacted signal strength, leading to frequent connection drops and input issues.
To improve connectivity, I decided to relocate the antenna by extending it using a blue wire from a Cat6 Ethernet cable, which was the best option available at the time. While the wire’s dimensions and properties might not be ideal, a Wi-Fi antenna from an old laptop or router would likely be a better choice.
Using a scalpel, I carefully removed the insulation on the PCB and soldered the new antenna, ensuring it was positioned as high as possible within the keyboard.
The results were—the wireless range significantly improved, connection stability increased, and issues such as repeated keystrokes and random disconnections were drastically reduced!