If your device blows one power supply that’s random enough, but for it to blow a replaced power supply leads me to believe that your home wiring could be causing the issue. If you have a bad ground on the circuit it’s plugged into or if something is causing power surges that would result in the power supply blowing a fuse which exists to ensure that a power surge can’t fry your entire system.

Usually with any device that uses power through the wall theres a safety fuse to ensure that the 120 volts from the wall doesn’t destroy the device in the event of a power surge. If a surge happens it will cause the electricity to move into the system and without a fuse it would destroy the sensitive components on the device.

120 volts is a substantial amount of electricity and its far beyond what any household product needs (except a dryer and some stoves). Thats how you’re able to connect multiple devices with a power strip through one plug. Electronic devices use a power inverter somewhere in the device which takes the 120v and scales it down to a fraction of that in order to provide the power level needed for the device to operate (usually a few watts).

If the full 120v surges beyond the power supply capability, there’s a fuse which is designed to handle a set amount of current and anything more will result in the fuse blowing which leads to a new fuse being required (most likely in the form of a new power supply unit) which does suck but if that fuse wasn’t in place then the surge would fry the chips on the logic board and render the device unfixable. I would investigate your circuit and see if that’s your issue.