I, too, have the same problem. I think it is related One Drive updates as OneDrive.exe disappears after an update has been pushed. These updates seem to happen every few days/weeks which coincide with the disappearance of OneDrive.exe. It seems
to me the update process is broken. BTW I have version 18.111.0603.0006. It was released on 7/9/18 and today, 7/10/18, OneDrive.exe was missing.
I've been stable since 6/25 (well, 6/23 actually).. Strongly recommend: uninstall, run a registry cleaner, reboot, then run the standalone install.
In
that order. I'm convinced there's a registry key involved. As I said, mine's been stable for a few weeks now. FWIW, the standalone install (https://go.microsoft.com/fwlink/p/?LinkId=248256)
is still at 18.025.0204.009