Xbox 360 saving settings failed?

This has been happening for months. I have an xbox 360 and when I play minecraft and halo it says "saving settings of gamer profile failed to write," or something like that. Also i can't get achievements and sometimes it randomly signs me out of xbox live. I've done some research and it says my gamer profile may be corrupted. I checked and for some reason it says that my brothers gamer profile is corrupted, but none of this is happening to him. I'm very confused.