I suspect there was an algorithm change recently.
I'm not sure if it's because the videos I've uploaded recently use the new cards feature, but it seems like things are better for some videos, and worse for others.
I'm not sure about the un-sub issue. I don't think I've had that particular issue, but I hear a lot of YouTubers mentioning it in their videos. I always schedule my videos -- maybe videos need to already be uploaded for a certain amount of time (and finish going through CID scanning processes and whatnot) before the un-sub issue can no longer happen?

I'm not sure about the un-sub issue. I don't think I've had that particular issue, but I hear a lot of YouTubers mentioning it in their videos. I always schedule my videos -- maybe videos need to already be uploaded for a certain amount of time (and finish going through CID scanning processes and whatnot) before the un-sub issue can no longer happen?