Repeated crash when using "search in"


I am currently writing my PhD thesis using Scrivener and have a lot of documents, research documents and images in the binder. The .scriv folder is 600 MB, with 3000 files and 322 folders. Scrivener keeps crashing whenever I try to use the “search in” box. is this because of the size/number of files? It does not happen with my smaller projects, so I am assuming so, but it is really frustrating. Any advice/assistance?