i found a 12v 2000mA adapter, ran good for a day or so, today after watching netflix for 2 hours, froze, green screen and won't boot any more. stuck on logo screen.
I got one of these:https://www.ebay.co.uk/itm/400947959327A bit expensive but works fine. All power related issues have vanished.
I have also been using the 12V / 5A power supply for two years. it's ok. I have an internal 3 TB hard drive. I recommend this power supply.