This may not be of any help at all...but when I was using PSVR on 5.05, for whatever reason, after a while MiraHen would tell me basically the same thing, and wouldn't work. I had to resort to using a different Mira that didn't have HEN in the title, and then it would work. Again, this was on 5.05 and was at least a year and a half ago, so I'm not sure if this is actually a similar issue or not. At the time I couldn't find ANY answers on the subject, and just figured out the aforementioned "workaround" on my own.
Good luck!
Good luck!