I had a preorder in for the SC600w with Zebralight and asked them what was going on. This is the reply I received:
The SC600/SC600w affected by the 5min step down 'bug' come from a very small batch (about 3 dozens) that contains some new features (hidden) but with the timer inadvertently turned off. All other production batches of the SC600/SC600w or H600 (same driver and software but with different H2 settings) are not affected.
I wonder what the new hidden features are?