Ever since the 2.1 Patch I've been having crash issues, but only during the new content. I've tried updated my graphics driver and lowering settings, but they don't seem to resolve the issue. I've been able to isolate the issue to the following fights:

-First and Second boss of Haukke Manor (Hard Mode)
-Second Boss of Copperbell Mines (Hard Mode)
-Second Boss of Pharos Sirus

The issues start up when the AoE phases of these fights begin. Reproducibly, the following will occur:

-Sound Effects/Music cuts out
-Controls become unresponsive, or lag
-Crash-to-Desktop (Unexpected Error (2)(17))

It's worth noting that Garuda EM gave me no issues. I have not tried Crystal Tower yet. As I mentioned I had no issues prior to the patch and it only appears to happen in the new content.

If anyone is having a similar issue or can direct me to a related thread (I did not see anything related from a search) I'd appreciate it. As you can imagine this is quite frustrating.