Chinese no-name YXY-FGD-50W White goo under the LED metal backing, only covering about 1/3 of the area, as originally placed blob , not fully splurged. Bowing of the metal at rear of the LED array , probably at original placement due to blob shape of the goo , only maybe worsened in use. So heatsinking via the periphery only , ie delayed heatsinking.
The 12v 5A SMPS units from China as well only have a thin seam of white thermal paste at the edge of the switching transistors to make it 'appear' properly done, there is none between the transistor and the heatsink = early failure.
I have to reapply paste on all before I use them.
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