Hey ,
I’ve only had this freezing with UE4, specifically projects built on 4.8.3 and 4.9.0. This only happens when opening a project’s solution and then pressing “Start Debugging” (or F5), and I’ve had it happen through opening the .sln file from Windows Explorer and also through opening the solution from VS.
It’ll freeze on loading symbols, but it’s not always the same symbols. And like the others have said, it happens every so often, so it isn’t 100% reproducible.