KMail Dying

Hi all I keep having a problem with KMail on SuSE 8.0. The app keeps intermittently stopping receiving emails. I can work in it read mails, send basically work as normal but it won't receive emails. If I close the program down and go to Sysmte Guard it says the process is still running. If I kill it and restart KMail it all works normally. This normally happens maybe once a day but it's done it 4 times already this morning. Any ideas, I wouldn't know where to begin. Cheers Matt