Does Engagement Groups REALLY hurt your Instagram Account?

I have been using Engagement Groups for almost 2 years, but for the last two months I had been losing HASHTAG REACH.

Some months ago I used to have around 80% reach from hashtags, right now it is less than 50%, and my last post didn´t have any reach.

Some friends feels that are stucked and that Engagement Groups are not helping them anymore.

All this evidences proof that there is a problem with Engagement Groups, but I would like to know if you had experienced something like this?