An update. I'm not sure how much faith to put in any of this, but I'll just report what I've been told. This site has, for quite a few years now, been hosted by a company called JustHost. They were recently acquired by a company called BlueHost, and that may be what triggered things going so badly. Until this week, however, I was still able to access the tools on the JustHost server. Now it forces me to a BlueHost login, and from there I can't even get to the files or the database. So even if I wanted to migrate to a different host (and it's definitely being considered!) I can't get access to anything. They tell me that there's an issue with the migration. Something about database cross references. I couldn't get a clear explanation. But they're working on the issue. ("Rest assured," they tell me.) The "Too Many Requests" errors, they say, are because of database pointers that need to be resolved. I opened a case on Tuesday and was told it would take 48 hours to resolve. I checked in today, and they're asking for another 48 hours. Needless to say, I'm not filled with confidence. I guess that if the issues get resolved and things look good, we'll stay where we are. And if not, I can start looking for an alternative once I get access to the files and database once again. Migrating to a new host is more of a project than I care to take on, but if I have to I'll get to it when I can. And that's where we're at.