Hi Sierra Games.
I’m sorry to hear that you experience regular freezing while using UE4, but this isn’t likely to be a bug with the engine itself, as it does not occur internally or for the majority of developers. If you are able to determine otherwise and that there is a specific reproduction case, please let us know. UE4 does require a powerful system for development, so you may need to consider an upgrade or run system diagnostics to determine if there may be some other issue at play. Numerous discussions are available across the Answerhub and Forums where developers have recommended the ideal systems for development.
Cheers