Well, this is embarrassing....
Since installing Catalina my mouse has been a bit jumpy. (Catalina also broke the use of the dongle, so I had to switch to Bluetooth.) I've been blaming Catalina for causing the jumpiness. This morning it became worse again and I was furious that Catalina was so terrible.....and then I checked the battery level of the mouse. Whoops.
Charge your mice, folks.
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