Hacking USB Loader simply stoppnig/restarting

[FoxForceFive]

When I play a game for over around an hour through the usb loader the Wii either simply switches off, or restarts. No error code, nothing.

Anyone got any ideas what may be causing this, or suffering anything similar?

I'm using a Maxtor 320gb HDD & m-teks kidproof usb loader 1.1.