frozen bm smell

Hi mummies, anyone gone through this whereby your LO seems to reject ur warmed up frozen ebm, and the ebm seems to smell? Mine smelled like vomit. Did a little Google search and suspect it is due to lipase activity. Would a lactation consultant be any helpful if i consult him/her? Hope to make feeding of my LO as pleasant as possible. It is very stressful and unhappy for us now.