I just watched a review where the guy said that the did didn't like the provari. But that was back a few months ago with the other screws. Has this issue been resolved with the thumb screw and the extension screw on the pos post?
One other thing that might cause problems is that the top cap of the Provari has a tendency to become seperated a little from the body of the Provari. If that occurs, it may not be getting a good contact with the battery. Although if that was the case, I would think that you would have problems with everything, not just the DID.
I have a Provari and used it with my DIDs for months before I got the Poldiac and never had an issue.