i had the same kind of problem some time ago, don't remember well how i resolved it but here some thing to try:
with headset unplugged and oculus app not launched , launch steam and steamvr. Then launch oculus app and finally plug the headset.
I think that's what i've done to get steamvr back, or at least some variation of this.
other thing i could guess is in oculus app setting, in the general tab :
if checked, uncheck "auto update app" and "unknown source" option then validate them again.
i don't see many thing else that might do the trick, and as i connect now only with virtual desktop i don't launch oculus app anymore.
ps : you might perhaps wan't to try that with and without steamvr launched and the headset plugged.