After rolling out the stable build of Oxygen OS 9 for users of the OnePlus 5 and OnePlus 5T, OnePlus is now beginning the roll out of a minor update to the Android Pie based Oxygen OS 9.
The update brings along a bunch of bug fixes for the phones, including one for the phones randomly rebooting — something we observed happening on our OnePlus 5 units as well.
The update is being rolled out incrementally, so it might take a while before it reaches you.