Three days have passed without issue, so it seems to be fixed.
A bad cable segment, mux/demux or similar might have explained most of the symptoms (intermittent packet loss, slow connections and timeouts). But why did Google and Gmail always remain available, unless every time I tested those (about 20-odd times) I just happened to catch a good period? Unlikely, but possible.
Anyway, it's fixed; it wasn't my equipment; and, I'm happy again (as much as anyone can be with Telstra).
Thanks, everyone, for the advice and support.
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