Not sure, but here is a few things to try.
There is a breaker on the inverter, try to reset.
Make sure your saleman switch didn't get turned off
If you are having to hold down your aux switch button, sounds like your running you lights off your chassis battery, be careful not to run down the chassis battery.
Have you measured the voltage on the house battery?
Loose connection on house batteries?
2011: 54 days, 2012: 218 days, 2013: 175 days, 2014: 196 days
2015: 188 days, 2016: 72 days,
2009 Berkshire, 390QS, and toad