4.20 crashing days after release

UE4.21.1 will probably still receive hotfixes before UE4.22. , so I would just recommend for production purposes to use the latest stable release, so now it would be UE4.20.3. So far, the only not recommended release would be UE 4.19.x, but all others are OK to start a project. Trying to create something on the latest active release can always come to point of having severe issues that can put your project on a hold status.