When it prompts for Recovery, and you have tried to recover without success, simply press Cancel and it will not prompt again for that file.
Yu should consider installing and using the Timed/Dated backup utility, download from
http://flowcont.hu/LO_oxt_store/oxt/tim ... v1-2-2.oxt
Note that this does not replace the normal Save mechanism - it must be separately invoked, either from its toolbar icon or its entry on /File menu.