I was double checking my hibernate mode settings and noticed the Sudden Motion Sensor had been reenabled. It's highly likely that this change happened when I installed 10.11 public beta 5. With SSDs it's recommended to disable it because if it detects motion it will kill all read/write processes until the motion stops. This is completely unnecessary with SSDs and can mess you up in situations where constant live read/write is important, such as recording.
Apple has an easy way to disable it here: https://support.apple.com/en-us/HT201666
Apple has an easy way to disable it here: https://support.apple.com/en-us/HT201666