I'm new to growing but I've read multiple source which claim that autos HATE being transplanted at any stage and that it's best to start them in their permanent place. I'd never recommend transplanting a plant while it's flowering, cannabis or otherwise, since it stresses the plant and disrupts the root structure when it wants to focus its energy on the flowering process rather than reestablishing roots. Your situation is likely to be transplant shock and it'll be very difficult to save the plant. Harvest what you can, that's my recommendation.