Buffing, ends with a craxh

I have gettign a lot of buffering Lately and I don’t undetadnd why..

I just saved a copy of my project and it buffered for several minres; and went into “white-out” before it finallyb finished.

Sometimes when I go into the workspace menu the same thing happens. Yesterday it went into buffering several times when I was accessing my workspaces. I couldn't duplicate to day. So it's inconsistent.