Dust, I did not make any changes to the printer. It runs normal with Marlin 1.0.2. (Well...not normal but that is another issue, it doesn't reboot, though!) Since I a had problem with RC8 I flashed back to 1.0.2 and it's OK there so the problem is RC8 and not the printer.
BTW, I have a 110V heat bed running over a SSR so power should not be a problem. I can preheat the bed and extruder in RC8 and it's OK, no brown-outs. Once I load a file and start the printing process the program reboots when it turns the extruder on. If the problem is brown-out the question is why is RC8 that sensitive and 1.0.2 not.
Edit: Forgot to mention that when I had the computer hooked up to the board and ran the print file through Pronterface it rebooted too so brown-out is not the problem since it got it's 5v from the computer.
BTW, I have a 110V heat bed running over a SSR so power should not be a problem. I can preheat the bed and extruder in RC8 and it's OK, no brown-outs. Once I load a file and start the printing process the program reboots when it turns the extruder on. If the problem is brown-out the question is why is RC8 that sensitive and 1.0.2 not.
Edit: Forgot to mention that when I had the computer hooked up to the board and ran the print file through Pronterface it rebooted too so brown-out is not the problem since it got it's 5v from the computer.