Just out of curiosity: On which kernel are you guys on at the moment?
With the latest updates I have several hickups, meanining: random reboots... they occur after some days, sometimes 4, sometimes up to 10. As I have not written down the kernel I was working flawless for quite some time. I will do my homework better now but as I am running my machine headless once it reboots all the logs are gone what went wrong...