Default The problem with the performance

People need help or advice. Came to see me this tablet, but constantly overloaded. Flashing not help. Can anyone help what? Model the way mz600

Here is such a damn thing work. Tablet flashed version 4.0.4. Sew normally without problems. But as soon as I start to work on it (the menu or just flipping pages), it hangs and reboots. But even in standby mode can be hung for the entire day. This is a problem with the loader or HW? P.S. in CWM, Fastboot and worked about 10-15 minutes, reboots discovered.