I have an Unleashed at home that randomly reboots rather frequently. The longest it worked was around 5 days. It is powered by its genuine power adapter, connected to my net provider's HGW by a CAT5e cable of 3m. It gets its static IP via DHCP.
After reboot logs are lost. I set up an ftp server on my local net (checked its working by hand ), but no logs transferred.
Working from home a lot and its painful to be broken off the net so frequently, many times in the worst moments.