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...
Here's what I can't do:

Connect via FTP

Hijack doesn't support the RFC-compliant "passive" FTP mode that most s/w now defaults to. If your client can do "active" or "PORT" FTP, then tell it to use that mode. The mozilla/firefox family cannot do that, so they just won't work.
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Connect with Jemplode (it just says "Loading..." pretty much forever - have left it some 20 minutes)
Filesystem being checked?
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Download more than a few tracks before the player locks out all remote connections (won't refresh over HTTP, etc.)

Ugh.
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After the freezing, eventually the player will start responding through the web interface again. This last time it took about 5-10 minutes. During the freeze it's completely unreachable via a browser.

Sounds like bad sectors or bad connection with the hard disk.
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Can anyone suggest any troubleshooting steps that I can use remotely?

Connect using HTTP, and GET /proc/kmsg and post it here.

Cheers