Documents disappear spontaneously

Hello, everybody.

We have very serious problem with Lotus Domino 8.5.

Sometimes documents disappears from one database.

If a user tries to open a document from view, error arises: “invalid or nonexistent document”.

There are no any errors in log.

It occurs with no regularity several times a month in one database.

We have tried everything: fixup, updall… etc. We upgraded from Lotus Domino 8.0 to 8.5 - the same problem.

We upgraded from 6.5.5 to 8.0.

There was no such problem in Domino 6.5.5.