Hi all, just for your information: Andreas Schwabs' term "memory corruption" made me thinking yesterday, so I simply installed memtest+ and let the system perform a memtest. Dropped many errors almost immediately. I Opened up the box (a HP microserver), cleaned out too much dust and re-plugged all connectors and RAM modules. After that a new memtest ran fine for at least an hour, but then again some errors were reported. So I think, I might have a bad RAM module and need to replace it. This could also explain some unexpected crashes/restarts during the last months. Thanks to all! Andreas