RSS feeds haven't updated

I've noticed that a number of my RSS feeds haven't updated. Of the 23 that I clear out regularly, only 4 have updated in the last 18 hours. Not all of these sites will have new content, but there are several which definitely do (e.g. arstechnica.com, techdirt.com).

Looking at previous issues, it appears that this has happened several times in the past. In all cases, Flow Reader staff have done something which has fixed the problem, but it appears temporary at best.

I've had this problem in the past, when I had fewer feeds. Deleting the feed and adding it back in fixed the issue in that case, but that's a workaround at best.

Could you please:

1. Fix my immediate problem, so that my feeds come through.
2. Look at what causes the issue and, if it's something that can be automated, provide a link somewhere in the UI for users to do this on their own.
3. If the fix can't be automated and is typically fixes itself after some time, provide a method for users to force a refresh of one/all of their RSS feeds. A manual update is better than no update.