My mouse has terrible range from my computer. If it go too far, it disconnects. It has maybe a metre range.
I have openrazer with polychromatic installed.
Sometimes when my mouse is too far, the way to fix it is reclick the power button on the mouse.
The battery is almost full.
I’m on KDE as well if that helps.
It seems to use the 2.4 GHz wireless frequency, which is notoriously overcrowded with wifi, bluetooth and all manor of wireless connections. Any of these will lessen the stable connection length. So do you use other wireless devices in the area between your mouse and the PC?