LibreOffice causes desktop to flicker/crash

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http://askubuntu.com – I have been working on two documents in LibreOffice (one text document of 40 pages and one presentation with 230 slides). I have been copying from the text document and pasting into the slides. Around the 120th slide, or so, many times (as I copied) the screen flickered, the windows disappeared, or the screen went black with stripes on it. I do not seem to have these problems with programs other than LibreOffice. I assume, that it is pretty close to crashing completely, and I had unresponsive spells in Libreoffice before, where I had to restart the computer. (I use a bonobo extreme with NVIDEA (HowTos)