Client crashes are much more frequent now

Since yesterday’s update, my client is crashing much more frequently. It seems random. I haven’t been able to pinpoint any trigger to make it happen, nor does it happen “every 30 minutes”. I’m on an 8320E / 16 GB / R9 280 under Windows 7. Since “random app crashes” are the #1 sign of faulty memory, I’m running Memtest right now. It’s been on for 12 hours at this point without any errors, but I’m going to let it run another 30 hours or so.

In related news, if I alt-tab out of the game (to check a map or consult console documentation, for example), the server always disconnects. This is new since the last update.