since few week I'm observing a strange behaviour of my linux box. It randomly restarts without any evident cause. messages, syslog and dmesg do not point to any direction. Looking at bios (dmidecode) neither brings no news. I also redirected kernel messages at grub level to a serial port, another pc is logging serial output. In spite I had already two reboots I didn't get any trace of the cause.
can a defective PSU cause such issue without leave any track? can anybody sugest me any other way to investigate on this matter?