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How large was the source file? Did it come from a different source than usual? If the original was full of junk, calibre will encode it all creating a large file. Sony's are slow if sections get close to 250k. each. Has that setting gotten changed?
You should be aware that LRF has not been supported by Sony for years now. It went to EPUB. You might consider going with EPUB from now on since your 505 can read it. When your 505 finally fails, that will leave you with a less giant conversion job, should you get a device that does not read LRF.
Once LRF was no longer officially supported by Sony, the developer stopped working on the converter since it was basically a waste of time, compared to other endless and pressing needs. So even if you should discover a problem, it is unlikely to be fixed.
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