The RC-505 contains an Auto Off feature which shuts down the power after it has not been used for 10 hours. This feature is designed to conserve power in case you accidentally leave the RC-505's power on. If you'd like to disable the Auto Off feature, here are the steps.
1. Press SYSTEM.
2. Press the parameter right button until "Sys: Auto Off" appears in the display.
3. Turn the MEMORY/VALUE knob to set the switch to "OFF."
4. Press EXIT when you're finished. The new setting is saved automatically.