Looking at the (pads facing you):
On many 3010s, there’s a green/white dot or a near cathode. tvzt-3010-03up led
Likely a cold solder joint. Reflow the pads with flux. Alternatively, the LED driver is going into protection mode due to a short elsewhere in the string. Looking at the (pads facing you): On many
Model # LED-D35-2. Input AC 120V; 60Hz. Output DC6-10v; 700mA. Load 6-9watt LED in series (It drives a pair of TVZT-3010-03UP LED' 60Hz. Output DC6-10v