Well, if you really have those cleaner jobs off, then you probably have some very large tables which may cause problems.
Like I said, figure out which job it is that is hanging like that. I'd also kill it if you can. If you find out which it is, try replacing the file. Also, look to see if a plugin is using a hook in one of the jobs and it is the plugin causing the problem (you can see the hook name in the file and then look at your list of plugins).
As for why it was fine and now isn't? I cannot explain why servers do the things they do and so I no longer even try. They truely baffle me at times.
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