went from w2 to 1099 within 3months, now can't get loan

We are in the process of building a home, in Houston, TX when we first started we were w2 workers in the oil field, with good income and had no problems with a pre approval, but now closer to closing time, we have been 1099 workers for the past 3 months and are now facing difficulties getting a loan. We have been turned down by several portfolio lenders now and not sure what other options are out there for us. Although we recently switched to 1099, we are still in the same line of work, have decent credit and income is better than with the W2. We are able to put down 10-20% percent. Sales price on house is 375,599. Any help would be greatly appreciated as we are scheduled to close next month, and already have money invested. Thank you.