@angelvalentinov123
Update your post to include full system hardware specs and OS information.
Include PSU: make, model, wattage, age, condition (original to build, new, refurbished, used)?
Disk drive(s): make, model, capacity, how full?
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Per
@helpstar 's post you should be able to prevent the mouse from going to sleep. A few seconds should not even be configurable with respect to elasped time before going to sleep.
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Bluetooth uses 2.4 GHz.
This mouse?
https://genesis-zone.com/product/zircon-500-black
And you have the mouse's small USB dongle plugged into one of the computer's USB ports?
Try using other USB ports and also try using a USB extension cable to raise the dongle up and away from the host computer.
In Device Manager > View ensure that "Show hidden devices" is checked. Does Bluetooth appear?
Do you see the mouse listed anywhere? E.g. " > Mice and other pointing devices"? Click to open a list of devices.
If the mouse is listed, select and click to view the Properties. Check all of the tabs - especially Events and Power Management.
Take a look in Reliability History/Monitor. There may be some error codes, warnings, or informational events being captured just before or at the time the mouse appears to go to sleep and/or wakes up.