frequent mupdate master mailboxes.db corruption, anyone else?

[Sergio Devojno Bruder]

I'm fighting with frequent corruptions of my mupdate master server
(high volume, currently 3.9M mailboxes) with Cyrus 2.2.10.

We've tried switch away from skiplist to berkley DB, same result.
This problem is resolved somewhere?  IE, there is hope in trying
2.3 branch or something like that?

--
Sergio Devojno Bruder