If printing via a standard Windows printer driver works OK (without timeout delay), then it is possibly not the same problem as was widely reported for the LJ P2055 (and which, I think, was resolved with a firmware update).
You state that "Sending FF-code doesn't help".
Can you post a sample of a captured (sanitised data) output stream (including the suffixed FormFeed control-code character), assuming that your accounting software application provides the facility to do the capture (analogous to the standard Windows 'print to file' option).
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