if there is no autosupout.rif file, it means there was no software crash, and your router rebooted either because of power surge, or because there is not enough power. Do you use PoE? How long is the cable, and how many volts are supplied at the bottom?
I’m using the DC power supply that came with it. It is plugged into a 550va APC. The rb153 is staying powered as is a Ubiquiti NSM2. The entirety of my house is also unaffected - from my overly sensitive clock radio to several computers.
It has been up for about 36 hours and is at heavy (upwards of 100%) CPU load. Winbox takes a good 2 minutes to launch, DNS queries to it (it is caching) are delayed.
I went to /tool profile and flash was 70% of the usage for a minute or two. After this, it seems to return back to normal.