I've built a i2 Reprap prusa mendel with a card reader and LCD display etc for stand alone printing. However occastionaly my reprap goes to sleep.
There is no sleep commands in the gcode and with my reprap not being connected to my PC there is no way to wake it up. I've been using the same setup for over 800 hours of printing and this has only happened about 10 times but it is a complete waste of a print. Every time it happens all I can do is reset my reprap, bin the half printed parts and start again.

Can anyone help?