Strange K-mail freezes

Hi We have experienced strange k-mail freeze-ups. XFree86 and KDE is the latest downloaded 2-3 weeks ago. Base system is SuSE 7.2 What we have found, is that sometimes when there is few programs open (k-mail, staroffice, kwintv and konqueror in different desktops), and then we open a PDF with acrobat, then close the pdf and acrobat, k-mail has frozen, and has to be killed. We did try today to really push the acrobat / k-mail, but we could not crash it in any way.. Had tenths of program open, drag kwintv all over the place, and did all weird stuff that we can imagine, but no.. it worked fine. Does anyone know any problem that could relate to this one? Jaska.