Make sure the batteries are good... Then check for anything electrical in a direct line between the mouse and the Bluetooth receiver on the pc. Power cables, lights, power supplies, etc. will pollute the signal with interference, or anything with metal or mesh that might block it. Again, just stuff in a direct line. I rearranged some things on my desk and got way better response from my Bluetooth mouse. My .02 :-)
It’s a non-Bluetooth mouse with a USB gizmo to provide the wireless connection. (I don’t understand why Bluetooth didn’t catch on in the Windows world.)
This mouse worked fine for years on Mac and Windows machines. It now fails on multiple computers, so it’s not a situational problem. Lately it’s just gone a little off, often sending two clicks for each press of the mouse. I suppose I could try taking it apart to clean out the little microswitch that’s probably responsible, but it’s a better use of my time to just replace the darned thing.