I have one defect POW which burns, melt plastics and shows the problem often described in internet.
Created a ticket but since 17th June 2018 no response.
6 months ago
I have experience of their support. It is useless. On the rare occasions you get a reply they always suggest pointless things.
I’ve tried contacting the other options, but you still end up nowhere. I’ve even tried contacting them on twitter. Essentially there is no warranty. They are cheap though. I’d just dump it, or open it up have a look and upload your own firmware.