That confirms what I was thinking then. One of the LED's has failed short circuit. (If you have the same problem with 2 power supplies, it can not be the power supplies.)
Which unfortunately means you are going to have to test each one by removing it from the light, you can't test "anywhere" as they are all connected to each other (Parallel) But this brings me back to what I said earlier, can you get replacements, I could not find any.
There is however a couple of things you can try. (No guarantee) As the light fitting is made from uninsulated metal, see if the outer sphere is touching the inner sphere, or is there something bridging the spheres. (Other than the LEDs)
The other thing is check all 96 LED's and look for one that has black spots, it will be the one that has failed.
As the light fitting is designed so all the LEDs are in parallel you can remove one and the remainder will still work. (Old lights were wired in series, but caused just as much "fun" trying to find the failed one.)
I wish you luck, sorry there is no easy way, its like Christmas tree lights used to be, hunt the failed lamp. Let us know how you get on.