My DS412+ is now a decade old. Moved it from a 110v environment to 220v in another location. Noticed that after a year the original power supply gave out (mid-2021). Replaced with a random power supply that answered to DS412 but it had 7a. A year later in late 2022, that one gave out too. Replaced it with a 9a model, surely this would be good. UPS with a voltage regulator in front of it meant that surge should not have been a factor. That unit lasted about 6 months which was around mid 2023. So ordered one of the better rated models from Amazon US hoping to get a better built unit. Wish me luck.