If Logitech Gaming Software reverts to default settings
Logitech creates some of the very best mice, but the software needs work, especially its so called Gaming Software (LGS). I use the G700 model and strange things happen — sometimes all profile customizations are lost, have reverted to the default settings, or mouse speed changes, etc.
For the moment, there is no way to avoid these things, if you keep using LGS, however, are you absolutely sure you need it?
Logitech SetPoint, the main Logitech software, contains profile settings too, along with macros. It will even let you import and export profile settings to xml files!, and best of all, it doesn’t have the problems of LGS.
Therefore, think about uninstalling LGS, using instead only the SetPoint software, making also sure to uncheck the option “Use OS native drivers for pointer speed and acceleration.”