I would say that there is more to the Darbee resets than just a poor performing power supply....although, I believe it is a big part of the equation, as in the couple times in the past that my Darbee started to do the factory default reset, replacing the power supply seemed to cure it.
But..... I also had my Darbee reset itself recently... .even with the new power supply. In this case though, I was in the middle of troubleshooting a defective WD live streaming device. My Darbee is on the main HDMI output for my Denon receiver, inline with my projector. But, during my testing, I was using my secondary Denon HDMI output connected to a small monitor. As such, during the testing which consisted of booting and rebooting the streaming device many times, the Denon was constantly re-handshaking not only the HDMI input for the WD live, but both its video outputs... one of which has my Darbee.
After finishing my troubleshooting, I noticed that my Darbee had that "all lit up look" of a factory reset. Sure enough, it had. But, ever since then, it has been flawless again. I fully believe something in the numerous funky HDMI handshaking that was going on prompted this latest reset. Something to do with a voltage or signal change/drop at a certain time just seems to trick the Darbee into thinking that there has been a command to do a Factory Reset I believe.