It’s annoying they still don’t make a usb-c unifying receiver.
Previously I used a wired mouse, plugged into the dock, which worked great. However, I needed a new mouse as that one started to fail and the only options available through my company were wireless.
The reason I ask is I have noticed this issue too when too many things are placed between the receiver and the device.
I didn't have anything other than the laptop between the receiver and the mouse. I was going to try and move it closer to see if it helped, but with some of the other cables plugged into it, I can't really move it much.
[1] https://www.caldigit.com/wireless-keyboard-mouse-not-working...
But that’s a wild ass guess.