I think it must be because my parents which have been trying to fix the fish pond was on and off-ing the main power. This is why I have decide to start purchasing online UPS to try to lengthen the life of my power supplies. Each power supply for readynas NV+ is close to 150 usd. I have already 3 of them gone quite recently. Just replaced 2 of them. Now another one of them died. Like 3 of it could buy me an online UPS which when there are electrical trip or they decide to off the power the NASes will still be alive to withstand the 10-20 min onslaught.