Are you using XP PRO?
If you are it just a bug in MAYA running on XP.... Try setting your display, appearance propertise, to windows classic style.
It might still do it a bit... but it works 7 out of 10 times for me now
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb