I went through my contacts and paired down the feed on my Friendica server considerably. Mostly trimming ostatus contacts since I can't really keep up with that network these days. If I've gotten overly zealous I may have broken feeds to my ostatus friends that wish to continue following me. If that's the case hopefully a resubscribing does the trick. I will say over the last year or so of running a Friendica server and playing in the GNU social space I have a new appreciation of how difficult federation can be. I also have more of an appreciation for how diaspora and Friendica work versus ostatus. I'm keeping the ostatus channel open for those who want to continue to follow me that way but I'll likely not follow back on that network at least for now. Of course I may change my mind later.
Okay well I'm not sure the repair on my server actually addressed the issue with some of my ostatus contacts. It may be another one of those weird sticky GNU social issues. If I recall unsubscribing on GNU social still leaves and entry in its database and that may need to be removed before a connection can be properly established. At least that's what I recall dealing with other odd issues. Of course that's pure speculation on my part. If you've subscribed to me but not receiving any of my updates feel free to let me know. Matrix and xmpp addresses are in my profile.