OnePlus has been doing a great job with CyanogenMod, updating it frequently to address the bugs in the system. The downside is that their software was far from perfect when the phone was released, but every update brings the phone closer to greatness. You can wait for the OTA or manually update using an incremental update zip from the recovery. Be careful though as this is only incremental and should only be installed over 38R.
Here are the list of changes according to OnePlus:
Fixed issues with memory causing screen artifacts
Fixed issues with random reboots and instability
Fixed issues with WiFi and modem crashes
Fixed issues with Filesystem
Fixed issues with “black bar”
Fixed issues with persist partition corruption
Fixed issues with AT&T VoLTE
The update zip can be found here.