I almost had a fire. One of my Gigabyte R9 270s stopped working. The riser cable attached got really hot and melted. Lucky I caught the burning smell before more damage or a full blown fire occurred.
Did the device have adequate ventilation? What temp was the device running at on a regular basis? How long did the device last?
The card never ran over 77C. But I purchased it used so who knows how many miles were on the card. Problem was when it stopped working I should have just unplugged. I left it attached to the riser.