it seems that magically my account stopped following many people I normally follow.

That's worrisome, I would hate to accidentally unfollow people that I normally read.

I haven't noticed if I had unfollow someone, but checking this would be too much work unless there is an automatic way to do this?

Either way, I just checked on my steemify app and there is the option to be notified if you unfollow someone, I had that inactivated until now.

It is really weird something like this happens right? What could be triggering it?