Hi, just saw your post.
I also have a Lenovo Legion and on my laptop bluetooth runs as it should run. I use it every day and have zero problems with it.
This is some info about my laptop:
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.17.8-300.fc43.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 6800H with Radeon Graphics
Memory: 16 GiB of RAM (14,8 GiB usable)
Graphics Processor 1: AMD Radeon 680M
Graphics Processor 2: NVIDIA GeForce RTX 3060 Laptop GPU
Manufacturer: LENOVO
Product Name: 82RG
System Version: Legion 5 Pro 16ARH7H
In order to get some help it is advisable (not to say necessary) to give info about your computer. Nobody on the forum is able to look over your shoulder and see what you use and what you do.
So please give a comparable list of info like mine, and explain what you do:
how you switch on Bluetooth,
how you add devices to it,
how you make them the primary devices to use.
What is switched off: Bluetooth completely or the connected devices?
Have you looked in the logs and especially around the time before and maybe even a bit after the moment things go wrong? Logs can be entered like this:
Open a terminal
type journalctl -b -0 (last character is a zero)
When you find something which looks like it has something to do with the bluetooth problem, bluetooth is mentioned in (a) line(s), then
with your left mouse button select line from about 5 minuted before it happened to maybe 1 minute after it happened,
click with your right mouse button on the selected text and chose copy in the pop-up menu
Here in your answer click the </> button in the top line of the message window, some texts will now appear where one line has a blue color.
Right-click the line and select paste.
Your texts will now show up pre-formatted which makes them easy to read.
The more info you give the better are your chances somebody can help you.
Help others to help you.