you on firmware 1.13?
when does it crash? when swapping sensitivity stages or when clicking the icon?
email logitech if u cant fix. they will either tell u or send u a brand new one. really good support for Logi, I've gotten lots of shit replaced no question.
crashes when using one of the mouse buttons to swap sesns stages. how do i check what firmware im on ? i updated firmware when i bought the mouse, like 2 months ago.