Same issue as other, even on latest macOS. I was tired of having to turn the mouse off and back on every time I came back to my Mac. Removing the Magic Mouse from Bluetooth preferences completely resolved the issue for me. I was a little hesitant for fear of not being able to re-pair but it was smart enough to realize I had a Magic Mouse nearby. System Preferences > Bluetooth > Clicked "X" next to Magic Mouse Turned Magic Mouse off using switch on bottom (I may not have needed to perform this step but did anyway) Waited a few seconds, turned Magic Mouse back on using switch on bottom Waited till Mac popped up with an alert that Magic Mouse is connected (I still had Bluetooth preferences at the time but I doubt this made a difference) Be patient during Step 4. It can take a minute to reconnect Upon reconnecting, the Mouse was immediately scrolling and I had not previously turned it off and back on to get it to scroll again after being asleep. I put the Mac to sleep, woke it back up, and still connecting. Hope this works for you!