When presenting these issues make sure to include your PC specs, windows/OS version and stuff like DxDiag, MSinfo32 and driver status. Just helps out support a little.
The obvious step one would be to do a completely reinstall, clean out all the setting files as well. However i would assume that has been tried.
The second step would be locating if it is an issue only in this game, only on the engine or on all games, this can narrow the possibilities.
Next i would either reinstall GPU drivers or format my PC.
Finally i don't really wan't to get in depth in troubleshooting and all that, that is supports job but interpreting the crash logs and digging around all that would be my next approach, which is what support is doing.