I noticed that as well, he's lost just over 27,000 subs in the last 30 days.And he's also now dipped below 8.2m on his main channel
I remember the days where every week he would gains loads of new subs and all his videos would get over 1m views in the first 24 hours.
Yet his latest video was one of the best video's he's done in a long time, featured Dianne and has the worst views out of the last few videos's he's filmed. So looks like people are starting move on/get board of Joanne content.
Also Dianne said on Insta stories she thinking of starting a YouTube channel. Which I'm not sure how that will work, as if she starts her own vlogs, Joe won't have any content to fill his vlogs out. So his Vlogging channel will just die even more.
I think Joe needs to realised that even Dianne can't help save his YouTube channels. The best thing would be to just have one YouTube channel and put all the video's he wants to share on that channel and spend more time focusing on other projects.