Since i installed Marshmallow on my G9000A, i've been presenting some problems. For example, after y lock-unlock my phone two times, the screen rotation, home button and recent apps button won't be working anymore. Nonetheless, before y lock and unlock my phone two times, those characteristics work perfectly, and with a third party app i can open the recent apps menu. Please, i could use some help, i don't know what may be causing this problems. With Lollipop everything works fine, and i'm sure it is a software problem because the buttons in terms of hardware are perfectly fine, the recent apps button even has his light, and the back button works perfect even in Marshmallow.