pages dispappear in google

Hello all, yesterday evening I noticed a major drop in my traffic
and I found out, that many of my indexed pages are not indexed anymore.
A new thread I made on my forum yesterday morning, was indexed fast in google, and then later when i looked it was gone again.

I see google is now adding breadcrumbs to the search results.

Is it possible that all the pages come back then, with the new look / the breadcrumbs in the google index?

Did anyone notice something similar with his site lately?

Kind regards
Marina

Can someone tell me where I can find good advice, or somebody who could look deeper into this issue,
since yesterday I get zero search traffic from google,
I had 13,600 pages indexed, and yesterday evening I have seen one time it was then on 1580 pages only, today I look and see again old results,
If anyone could give some feedback, advise would be much appreciated.

My site is ..... Gambling Bonus Paradise

On my forum Gambling Forum Bonus Paradise
I see google is there all day and viewing threads and posts
the google cache from the forum is also new from today Nov 23
So I am really clueless what is going on,