Hi! I am sorry to hear that! We tested the PowerBlock with quite a few extension boards and that should not happen at all.
Please contact me via email or webform (https://www.petrockblock.com/contact/) so that we can arrange a replacement.
So, I have mounted the PowerBlock and I have tested it for some days. It works almost as expected, spordically it shows unexpected behaviour. I will create a separate thread explaining my observations.
Anyway, thanks for supplying me with a replacement device.