Our 04 Allure had a problem for about a month, until someone told me to check to be sure the inverter/echo charger were both not tripped. I found a reset button on the front, and if memory is correct, another one on the back. This got me up and going, and never another problem for the next 3 years. That is when we upgraded to a Magnum MS2812 PSW Inverter/Charger, and all the related components.
I believe you will find that from the factory, the house batteries get charged first, and then the Echo will divert over and feed the chassis once the house are at the right level.
So if the inverter/charger echo system all check out, you might want to test to be sure that you don't have a bad battery in the mix. They due sometimes fail while in early life, and then the warranty will kick in...
Best of luck to you, and I'll follow the thread to learn for your problems