Rollback advice please

[Stagger Lee]

I'm in a game where we had a rollback not too long ago and things are going a little off the track. Items and troops disappearing, regular troops becoming commanders, mages losing magic and research abilities, and strange messages from the host (llamaserver).

Are there any rules we should follow when attempting a rollback, and how far back can we/should we go.

This game is early, but quite a lot of fun and I think we all would like to play it out.

Thanks for any help.