Some additional details: the time during which the issue occurs varies very much: from 25" to 6'20". The time between two consecutive issues also varies and can be very short, such as 30". -- Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)