Elecom M-XGS31BBSK Series User Manual page 66

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10) Follow the instructions of the downloaded installer to install the Bluetooth
driver.
With this, the Bluetooth driver is updated.
⑧ When using the USB Bluetooth receiver, change the receiver connection.
Depending on the specifications of the PC's USB port or USB hub, other USB 3.0 devices
used simultaneously with the mouse may generate noise that can worsen the 2.4 GHz signal
in the vicinity.
Examples of USB devices that may degrade the 2.4 GHz band signal
USB memory
Hard disk or SSD
Optical disk drive
Card reader / writer
LAN adapter
Others, all devices communicating data with a PC via USB 3.0.
You may be able to improve the situation with the following method.
Connect the Bluetooth receiver to another USB port away from other USB3.0 devices that
are in use simultaneously.