I have had another crash today and can give more details about the macroscopic behaviour of the machine prior to crashing. a) the crash requires kontact/kmail to be open. b) it seems that it is important to have IMAP and POP mixed as accounts c) you need to have a composer window of kmail open full screen mode (it is a 12" here). d) during the writing progress the prodromic symptom is the appearance of micro blackouts of less then a second of the screen during typing. These I can confirm, happen always when you hit the space tab as it seem. (As I am writing "blind" swiftly, it is difficult to sense which stroke is the right one, so I think(!) it is when I hit space). e) the crash happens, or with very large text and long persistent writing, or and especially, if whatever text is selected to do a copy and paste. Then the crash is immediate.