Hi @SAMBUEV,
Does this freeze your entire PC? Your clock won’t update and your mouse cursor won’t move? I have a similar issue but it is few and far between, usually happens if I leave UE4 open for >45 minutes to an hour. I’ve just been saving my work repeatedly and making sure to commit code changes in case it freezes. I’ve found that restarting UE4 every half hour or so to seem to avoid the problem, but obviously this is not a solution and sometimes building light can take that long.
This never happened when I was using anything below 4.18, skipped 4.16-4.17 so I’m not sure what’s going on. My PC specs are:
CPU: AMD FX-8350
RAM: 16GB
GPU: GTX 970
EDIT: Are you doing your project in C++ or blueprint? I wonder if Visual Studio might have anything to do with it?