It is a construction fault from the first batch, long read but the bloke who posted had the exact same problem. He exhausted all possible operator issues but still had issues ie inflated to 10 psi, checked line lengths etc etc.
kiteforum.com/viewtopic.php?f=1&t=2384933&hilit=north+dice+issue In particular, read page 6 where the North rep makes reference to construction faults in the earlier models:
"@No Idea (and anyone else who sees the issue he describes with their kite) Ralf also noted that some early prototypes had issues such as you're describing due to errors on the production side, so if you continue to see problems with your kite deforming while in its normal windrange, please get photos to your retailer that shows the problems. Just to reiterate, though, as with any three strut kite, if you're way overpowered and have your depower pulled but are still lit, you are pushing the upper limits of the kite and some deformation is to be expected (even 5-strut kites will start deforming a bit in these conditions)."