I've had the issue return in the last days - but support are trying to help. When I ran the Oculus diagnostic tool, I couldn't believe the huge amount of erros listed - mostly not being able to find files in the installation.
I reinstalled OH and since have had only two disconnects (one per day) which is far better, but still not ideal. What gets me is that the disconnects and reconnects are almost instantaneous - I hear the disconnected sound - or get a blank headset - and before I have even got to the notifications page, it has sorted itself already.
As an ex radio tech I would lay odds on that being a faulty connection somewhere, but with this voodoo, who knows?