The issue is rarely hardware failure. It is almost always a software conflict caused by a Windows Update or a service startup error. Once fixed, the Bluetooth usually remains stable.
Here is a comprehensive guide to restoring your Bluetooth functionality. 1. The "Magic" Hard Reset (Laptops)
This is often the fastest fix for hardware that has "disappeared."
Shut down, unplug the charger, and hold the power button for 60 seconds .
This sounds silly, but Windows 11 has a bug where Airplane mode gets stuck "on" logically, even if the UI shows it as off.
"An Empirical Study of Bluetooth Connectivity Failures in Windows 10 and 11: Drivers, Power Management, and User Interface Gaps" (Note: This is a hypothetical but plausible paper topic.)
Sometimes the background software that manages the toggle crashes. Press Win + R , type , and hit Enter.