Electrical issue

2012 Cascadia, DD-15 engine, Eaton 10 speed Ultrashift automatic. I am having a situation where the truck will lose all electrical power while going down the road. It is like someone is turning the key off and then right back on. Unlike turning the key off the only difference is it also kills the power to the power outlets. It seems to do it less frequently when running with the cruise control on. I have replace the engine wire harness, ignition switch and battery disconnect switch. The batteries are less than a year old and all battery connections are secure. It is not throwing any fault codes when this happens. W.W. Williams, Freightliner and my usual shop are at a loss as to the cause. I can't possibly be the only one this has happened too.