in the meantime, I eliminated the problem files.
when opening libre office writer, during all the time |I used it, a recovery program pops up, even if all files were saved in the previous session.
is this just to bring back to the screen the files that were open during the last session??
anyhow, here is where I now have a problem, during this recovery it gets stuck, the whole screen freezes, but I can move the cursor normally
now if I click the recovery box away, I can open all files without problems, sofar
presently using linux 20.3 and libreoffice writer 6.0
no new tmp files sofar
note that my tmp files were dated at an hour during which the computer was shut off ....