A small handful of people are reporting this issue.
LavishCrashMobile.exe launches when there is a crash detected in the game, its purpose is to pop up the crash report message and offer to send it in. It is bizarre that it itself is crashing.
It would seem that it's not attempting to report a crash with wow.exe/wow-64.exe, because it would terminate the crashed process. So my assumption is that it is a different process -- launched by the game or a program that loaded into the game -- that is crashing in the first place and thus causing LavishCrashMobile.exe to launch at all.
The issue has been tentatively linked with recent NVIDIA drivers. I've not experienced the issue yet myself (or it would be fixed already, probably). I have been on NVIDIA driver version 382.05 with no issue, but I just installed 385.69 for further testing.
So, as this freeze is occurring, it would be helpful to pop up Task Manager (Ctrl+Shift+Esc) to see if you can determine what process might also be launching at the time (and would shut down as well).
Edit: It may help to have Compatibility diagnostics in order to figure this out.
http://isboxer.com/wiki/Diagnostics