Hi, just a short update: with 4.9.0 from Stretch I hit this issue within a week and had to reboot the system. With 4.12.0-0.bpo.1-amd64 I run now for almost three weeks and the issue did not pop up. Either it is fixed or it seems to be at least triggered less frequently. Rainer -- Rainer Dorsch http://bokomoko.de/