Backup Lenders During Escrow? Concerned about underwriting...

[Adrienne Anselmo]

Hello, first post here and first time buying a home. I've been reading through the forum for a couple of weeks and I've learned so much here... amazed by how intelligent and insightful these discussions are.  I hope maybe  someone here can analyze my scenario and help me make the right move.

I am starting to suspect that my lender's underwriter will not approve me for a loan. I only have 28 days left before closing. I would like to start contacting other lenders right now, as a backup measure.

My thought is that it would be wise to have more than one lender looking over my financial profile and subjecting it to the underwriting process, so that even if one were to fall apart, at least I will have a chance to make the closing date on time with another.

Right now I am pre-approved for a conventional 30-yr fixed. The lender has already done an appraisal and I am in the underwriting process. Underwriting is proving to be more rigorous than I imagined, owing to the fact that I am a business owner. So I'd like to apply for a business statement loan with another lender. 

Question: can I submit my documents to more than one lender now that I am already in escrow? Would this entail multiple lenders contacting the escrow company or agents and doing multiple appraisals? Will it cause significant problems?