Hallelujah, I've found others with the same problem.
I have a Studio M1 Max and Studio display with a Google mesh base station sitting on top of the Studio and connected via ethernet to the Studio and to the Google modem. I have an MX Vertical which I've attached with:
- first using the Universal Receiver plugged into the back of the display,
- then found that the mouse can connect via Bluetooh and tried that
- Then attached using a Samsung Thunderbolt 3 cable to a slot at the front of the Mac Studio
- now back to Bluetooth.
I've attached a photo to illustrate.
In all cases, since installing the Studio, I've had problems with the mouse.
- Often it seems to double tap. In mail, if I right click to delete, often two emails will delete.
- Sometimes a mouse click doesn't seem to register
- In most apps, not all, dragging too highlight text is painful.
- Rarely will it just highlight the dragged area.
- Mostly it does random things like highlighting a single word
- sometimes it does a copy and move a small segment of text
- etc
I thought the mouse was bad. Purchased a 2nd one, but it's has the same effect.
I have an Apple extended keyboard connected via bluetooth. Very occasionally it will add an extra character, but I suspect that's caused by my fat fingers.
I glad to see here that the Logitech has known problem with 2.5 GHz and "reducing the polling rate to ridiculously low levels." This thread has suggests moving the mouse away from the Studio, and if using the receiver, increasing separation for that too. I'll also try increasing separation of the Google WiFi Mesh router.
However, I don't see why using Thunderbolt 3 cable doesn't improve things. Perhaps it's not well shielded, or perhaps everything is just too close together.