Hi Spider 9,
Not a great deal of use to you, but a few observations.
Did find the same trouble, suggested they looked into putting some sort of gravity or mercury switch into the mouse. It could then die or switch off when turned on to its back. Did have a play with a drop down switch underneath; but didn't get anywhere!.
I am now using a rechargeable one, keep forgetting to park it when finishing though. A bit of firmware to tell you to park?.