We have fixed one cause of the crash, but other causes still exist and are under investigation. The fix actually went into the 4.14.2 Hotfix, and our data is showing that we have reduced the frequency of the crashes (or rather the number of users who are experiencing them) by possibly up to about 40%. We will continue to work to identify the cause of the remaining crashes. Sharing your system specs and 100% repro steps (including assets that cause the crash) can help immensely. (please post your information to the UE4 Answerhub Bug Report section.)
Thanks