my sidebuttons stop working too, only way to make them work again is to restart the PC or unplug and plug in the mouse again.
And when they stop working, i mostly can't find the mouse in CUE, it doesnt show up at all, and when it shows up, it says on status: Error.
i attached the log files from today, it clearly shows some errors with the scimitar. 2016-02-22T18-32-30.txt