No I have yet to find the announcement BC supposedly made in April about the algo change for crash.
BC.game had changed the seed of some in-house games in the May month of this year. And they had made an announcement about it in the forum. In the announcement, the representative has mentioned that they are changing the seed to improve the 'provable fairness' of the games.
In our endeavor to constantly improve seed safety and provable fairness of our games, we will shortly be updating our crash,roulette,baccarat and keno with a new salted hash. The purpose of this post is for full transparency of this process.
Their representative had also
made a post about it in their ANN thread. Perhaps, they haven't made any changes on the server to make the game rigged. I think you are just unhappy with your losing streak. Either change your betting strategy or play at a different casino.