No luck?
I have made two returns in 4 months.
The first one had a big problem of coil whine (a very high pitched and unpleasant whistling)
The second one had the same problem, less recurrent, due to lack of time, I decided to keep it but unluckily it ended up burning out by itself after 3 months.
My electrical system is less than a year old and I use an inverter to avoid power surges.
Otherwise when the coil whine stops, it is very quiet and does the job of a power supply very well.
I hope the third one will raise my rating.
The service department I'm very happy with this product.