Question about Nanoleaf Shapes Hexagons Starter Kit (15x)

In your case, I would recommend filing a warranty claim or contacting the manufacturer directly.

I have the same problem here, even after about 9 months. Apparently it's just badly made.

If the power supply units do not supply power to two (galvanically) separate groups but are connected to each other via the panels, there will be no potential equalisation and they will damage each other.