Not saving progress after server dc'ed

This happened 4 times already and quite frustrating. Game freezes for 3-5 seconds, after that it tells that I was disconnected. It's not really nice when your are finishing a t15 or so map, but it happens, I get it.

But it not saving any progress in it, no items, no exp. In a story I found few exalts, lost it because of this bug.
But, for example, I will found mirror (unlikely, but still), what should I do, how can I preserve a progress?

And interesting enough, map you open - stays open. I mean fog of war thing.
So, some part of progress remains.