I have a intermittent loss of power that affects the clock, radio, power outlets. It happens randomly but in all modes of operation. I have also noticed a large amount of corrosion on the battery hold down bracket but no the terminals. I've inspected the center stack connections behind the console and retightened all grounds found. New battery. Any suggestions are appreciated. All other systems work as expected. Car details2011 XLE 4 cylinder, 129k miles, auto.

 

Check ACC relay.