apple TV locks up

Sometimes my apple Tv locks up and the remote will not back out of a menu. The only way that I have been able to go forward is to reboot the apple TV.
Also when I do not use the apple Tv for a few days it will not turn on , so I have to reboot it again. Do I need to reinstall ATV Flash?? Does anyone know how to fix my problems. I have been running ATV flash on my apple TV for a few weeks and it was like this from day one.

Thanks , MAO